// ---- Isaac-style stacking passive items ---- const ITEM_RARITY = { common: { weight: 100, power: 0.5, color: '#c9b8ae' }, uncommon: { weight: 55, power: 1.0, color: '#6fb1c0' }, rare: { weight: 25, power: 1.5, color: '#c9a227' }, legendary: { weight: 8, power: 3.0, color: '#e2472f' }, }; const ITEMS = { // ---- common ---- hollowpoints: { name: 'Hollow Points', desc: '+25% damage', rarity: 'common', cap: 6, apply: s => { s.dmgMul *= 1.25; } }, twitch: { name: 'Twitch Fibers', desc: '+20% fire rate', rarity: 'common', cap: 6, apply: s => { s.rateMul *= 1.20; } }, graftedtrigger:{ name: 'Grafted Trigger', desc: '+18% fire rate, +6% shot speed', rarity: 'common', cap: 6, apply: s => { s.rateMul *= 1.18; s.shotSpeedMul *= 1.06; } }, scalpel: { name: 'Scalpel', desc: '+25% shot speed', rarity: 'common', cap: 8, apply: s => { s.shotSpeedMul *= 1.25; } }, leadmarrow: { name: 'Lead Marrow', desc: '+25% range', rarity: 'common', cap: 8, apply: s => { s.rangeMul *= 1.25; } }, bloodshoteye: { name: 'Bloodshot Eye', desc: '+6% critical chance', rarity: 'common', cap: 8, apply: s => { s.crit += 0.06; } }, hollowneedle: { name: 'Hollow Needle', desc: '+50% critical damage', rarity: 'common', cap: 6, apply: s => { s.critMul += 0.50; } }, luckycoin: { name: 'Lucky Coin', desc: 'Better drops', rarity: 'common', cap: 5, apply: s => { s.luck += 0.2; } }, crowbait: { name: 'Crow Bait', desc: '+15% luck, +25% pickup radius', rarity: 'common', cap: 5, apply: s => { s.luck += 0.15; s.magnet *= 1.25; } }, magnetmaw: { name: 'Magnet Maw', desc: '+60% pickup radius', rarity: 'common', cap: 3, apply: s => { s.magnet *= 1.6; } }, gorgingleech: { name: 'Gorging Leech', desc: '+20% XP gained', rarity: 'common', cap: 4, apply: s => { s.xpMul *= 1.20; } }, hollowbones: { name: 'Hollow Bones', desc: '+14% move speed', rarity: 'common', cap: 6, apply: s => { s.speedMul *= 1.14; } }, brassmagazine: { name: 'Brass Magazine', desc: '+10% ammo efficiency, +20% ammo found', rarity: 'common', cap: 5, apply: s => { s.ammoEff += 0.10; s.ammoPickupMul *= 1.20; } }, ironstomach: { name: 'Iron Stomach', desc: '+½ heart container, heal ½ heart', rarity: 'common', cap: 8, apply: (s, p) => { s.maxHp += 1; p.hp = Math.min(s.maxHp, p.hp + 1); } }, tannedhide: { name: 'Tanned Hide', desc: '+8% chance to ignore damage', rarity: 'common', cap: 6, apply: s => { s.armor += 0.08 / 0.92; } }, bloodlust: { name: 'Bloodlust', desc: 'Kills may drop bonus XP', rarity: 'common', cap: 5, apply: s => { s.bloodlust = (s.bloodlust || 0) + 0.12; } }, // ---- uncommon ---- bloatrounds: { name: 'Bloat Rounds', desc: '+25% attack size, +10% damage', rarity: 'uncommon', cap: 5, apply: s => { s.sizeMul *= 1.25; s.dmgMul *= 1.10; } }, marrowglut: { name: 'Marrow Glut', desc: '+20% damage, -10% fire rate', rarity: 'uncommon', cap: 6, apply: s => { s.dmgMul *= 1.20; s.rateMul *= 0.90; } }, piercegaze: { name: 'Piercing Gaze', desc: 'Shots pierce +1 enemy', rarity: 'uncommon', cap: 5, apply: s => { s.pierce += 1; } }, ricochet: { name: 'Ricochet Ribs', desc: 'Shots bounce +1 time', rarity: 'uncommon', cap: 5, apply: s => { s.bounce += 1; } }, flayerkiss: { name: 'Flayer Kiss', desc: 'Hits inflict heavy bleeding', rarity: 'uncommon', cap: 5, apply: s => { s.bleed += 0.20; } }, emberjar: { name: 'Ember Jar', desc: '20% chance to ignite', rarity: 'uncommon', cap: 5, apply: s => { s.igniteChance += 0.20; } }, acidgland: { name: 'Acid Gland', desc: 'Hits may leave acid pools', rarity: 'uncommon', cap: 6, apply: s => { s.acidOnHit += 0.12; } }, hookrounds: { name: 'Hook Rounds', desc: 'Hits pull enemies toward you', rarity: 'uncommon', cap: 5, apply: s => { s.pullOnHit += 0.18; } }, sledgerounds: { name: 'Sledge Rounds', desc: 'More knockback, hits may stun', rarity: 'uncommon', cap: 5, apply: s => { s.knockbackMul *= 1.35; s.stunOnHit += 0.08; } }, chainsinew: { name: 'Chain Sinew', desc: 'Hits arc to +1 nearby enemy', rarity: 'uncommon', cap: 6, apply: s => { s.chain += 1; } }, mortarbone: { name: 'Mortar Bone', desc: 'Every sixth hit erupts', rarity: 'uncommon', cap: 5, apply: s => { s.mortar += 1; } }, homingtumor: { name: 'Homing Tumor', desc: 'Shots seek flesh (stronger per tier)', rarity: 'uncommon', cap: 4, apply: s => { s.homing = (s.homing || 0) + 1; } }, dentures: { name: 'Vampire Dentures', desc: 'Kills may heal you', rarity: 'uncommon', cap: 5, apply: s => { s.lifestealChance += 0.04; } }, spinecage: { name: 'Spine Cage', desc: 'Contact attackers take damage', rarity: 'uncommon', cap: 5, apply: s => { s.thorns += 8; } }, spitewell: { name: 'Spite Well', desc: 'Taking damage releases a blood nova', rarity: 'uncommon', cap: 5, apply: s => { s.retaliate += 10; } }, orbitcrown: { name: 'Orbit Crown', desc: '+25% orbital speed and damage', rarity: 'uncommon', cap: 5, apply: s => { s.orbSpeedMul *= 1.25; s.orbDmgMul *= 1.25; } }, ghoulheart: { name: 'Ghoul Heart', desc: '+4 max HP, heal 4', rarity: 'uncommon', cap: 5, apply: (s, p) => { s.maxHp += 4; p.hp = Math.min(s.maxHp, p.hp + 4); } }, // ---- rare ---- splittongue: { name: 'Split Tongue', desc: 'Twin parallel shot', rarity: 'rare', cap: 3, apply: s => { s.split += 1; } }, hydramaw: { name: 'Hydra Maw', desc: 'Fires 2 extra angled shots', rarity: 'rare', cap: 3, apply: s => { s.fan += 1; } }, backstabber: { name: 'Backstabber', desc: '+1 rear shot', rarity: 'rare', cap: 3, apply: s => { s.rear = (s.rear || 0) + 1; } }, splinterbone: { name: 'Splinter Bone', desc: 'Shots shatter into +2 shards on hit', rarity: 'rare', cap: 3, apply: s => { s.splinter = (s.splinter || 0) + 2; } }, orbitalknives: { name: 'Orbital Knives', desc: '+1 circling knife', rarity: 'rare', cap: 3, apply: s => { s.orbitals += 1; } }, volatilebile: { name: 'Volatile Bile', desc: 'Kills explode (bigger per tier)', rarity: 'rare', cap: 3, apply: s => { s.explodeOnKill = (s.explodeOnKill || 0) + 1; } }, deadmanswitch: { name: "Dead Man's Switch", desc: 'Kills trigger a fire-rate frenzy', rarity: 'rare', cap: 3, apply: s => { s.frenzy += 0.12; } }, boneplate: { name: 'Bone Plate', desc: '+½ shield heart each floor', rarity: 'rare', cap: 3, apply: (s, p) => { s.shieldPerk = (s.shieldPerk || 0) + 1; p.shieldHp += 1; } }, wormgut: { name: 'Worm Gut', desc: 'Heal ½ heart after combat rooms', rarity: 'rare', cap: 3, apply: s => { s.roomHeal += 1; } }, secondstomach: { name: 'Second Stomach', desc: '+½ heart and excess healing shields', rarity: 'rare', cap: 3, apply: (s, p) => { s.maxHp += 1; s.overShield += 1; p.hp = Math.min(s.maxHp, p.hp + 1); } }, twinhearts: { name: 'Twin Hearts', desc: '+1 max heart, heal to full', rarity: 'rare', cap: 3, apply: (s, p) => { s.maxHp += 2; p.hp = s.maxHp; } }, deadmansclock: { name: "Dead Man's Clock", desc: '+0.25s hurt immunity', rarity: 'rare', cap: 3, apply: s => { s.invBonus += 0.25; } }, rerollrib: { name: 'Reroll Rib', desc: '+1 perk reroll each level', rarity: 'rare', cap: 2, apply: s => { s.rerollPerLevel += 1; s.rerolls += 1; } }, // ---- phase 2 additions (clean, no new engine hooks) ---- chillgland: { name: 'Chill Gland', desc: '18% chance to chill', rarity: 'uncommon', cap: 5, apply: s => { s.slowOnHit += 0.18; } }, hookedsinew: { name: 'Hooked Sinew', desc: '+30% pickup pull speed, +10% radius', rarity: 'common', cap: 5, apply: s => { s.magnetPull *= 1.30; s.magnet *= 1.10; } }, gyroscopicribs:{ name: 'Gyroscopic Ribs', desc: '+2 bounce, +10% range', rarity: 'uncommon', cap: 4, apply: s => { s.bounce += 2; s.rangeMul *= 1.10; } }, marrowpiston: { name: 'Marrow Piston', desc: '+30% knockback, +12% attack size', rarity: 'common', cap: 5, apply: s => { s.knockbackMul *= 1.30; s.sizeMul *= 1.12; } }, splitcortex: { name: 'Split Cortex', desc: '+1 pierce, +1 chain', rarity: 'rare', cap: 3, apply: s => { s.pierce += 1; s.chain += 1; } }, gristlecord: { name: 'Gristle Cord', desc: '+0.12s hurt immunity, +4% armor', rarity: 'uncommon', cap: 4, apply: s => { s.invBonus += 0.12; s.armor += 0.04; } }, renderedfat: { name: 'Rendered Fat', desc: '+½ heart, +4% armor', rarity: 'common', cap: 6, apply: (s, p) => { s.maxHp += 1; s.armor += 0.04; p.hp = Math.min(s.maxHp, p.hp + 1); } }, whipcordtendon:{ name: 'Whipcord Tendon', desc: '+20% range, +8% fire rate', rarity: 'uncommon', cap: 5, apply: s => { s.rangeMul *= 1.20; s.rateMul *= 1.08; } }, rusteddiadem: { name: 'Rusted Diadem', desc: '+40% orbital speed', rarity: 'uncommon', cap: 5, apply: s => { s.orbSpeedMul *= 1.40; } }, gorgedtick: { name: 'Gorged Tick', desc: '+15% XP, +10% luck', rarity: 'common', cap: 5, apply: s => { s.xpMul *= 1.15; s.luck += 0.10; } }, bonemealpowder:{ name: 'Bonemeal Powder', desc: '+15% damage, +15% shot speed', rarity: 'common', cap: 6, apply: s => { s.dmgMul *= 1.15; s.shotSpeedMul *= 1.15; } }, rimedfang: { name: 'Rimed Fang', desc: '+4% crit chance, +25% crit damage', rarity: 'common', cap: 6, apply: s => { s.crit += 0.04; s.critMul += 0.25; } }, butcherstwine: { name: 'Butcher\'s Twine', desc: '+12% bleed, +8% fire rate', rarity: 'uncommon', cap: 5, apply: s => { s.bleed += 0.12; s.rateMul *= 1.08; } }, cindersump: { name: 'Cinder Sump', desc: '+12% ignite, +12% acid', rarity: 'uncommon', cap: 5, apply: s => { s.igniteChance += 0.12; s.acidOnHit += 0.12; } }, // ---- phase 3 additions (small engine hooks) ---- deadweight: { name: 'Dead Weight', desc: '+40% damage to enemies under 30% HP', rarity: 'uncommon', cap: 5, apply: s => { s.executeBonus += 0.40; } }, cauterizedveins:{ name: 'Cauterized Veins', desc: '+15% ignite, +25% damage to burning enemies', rarity: 'uncommon', cap: 5, apply: s => { s.igniteChance += 0.15; s.burnDamageBonus += 0.25; } }, hollowchoir: { name: 'Hollow Choir', desc: 'Every 4th shot fires a free extra volley', rarity: 'rare', cap: 3, apply: s => { s.choirEvery += 1; } }, sawbonecoil: { name: 'Sawbone Coil', desc: 'Expiring bullets split into 2 shards', rarity: 'uncommon', cap: 5, apply: s => { s.sawboneCoil += 1; } }, gluttonsgut: { name: "Glutton's Gut", desc: 'Hearts heal +1 extra; overheal becomes score', rarity: 'common', cap: 5, apply: s => { s.gluttonGut += 1; } }, slaughterrhythm:{ name: 'Slaughter Rhythm', desc: '+4% fire rate per recent kill (cap +40%)', rarity: 'rare', cap: 3, apply: s => { s.slaughterRhythm += 0.04; } }, painengine: { name: 'Pain Engine', desc: '+30% damage for 4s after being hit', rarity: 'rare', cap: 3, apply: s => { s.painEngine += 0.30; } }, thresherplate: { name: 'Thresher Plate', desc: 'Passive contact-damage aura', rarity: 'uncommon', cap: 5, apply: s => { s.thresherPlate += 1; } }, bloodmoat: { name: 'Blood Moat', desc: 'Kills leave an acid pool', rarity: 'uncommon', cap: 4, apply: s => { s.bloodMoat += 1; } }, ironlung: { name: 'Iron Lung', desc: 'The first hit each room is blocked', rarity: 'rare', cap: 3, apply: s => { s.ironLung += 1; } }, meathook: { name: 'Meat Hook', desc: 'Kills yank nearby enemies to the corpse', rarity: 'uncommon', cap: 4, apply: s => { s.meatHook += 1; } }, blooddebt: { name: 'Blood Debt', desc: '+35% damage, −½ heart container', rarity: 'rare', cap: 3, apply: (s, p) => { s.dmgMul *= 1.35; s.maxHp = Math.max(1, s.maxHp - 1); p.hp = Math.min(p.hp, s.maxHp); } }, // ---- phase 4: boss-exclusive legendaries (cap 1, curses allowed) ---- butchersoath: { name: "Butcher's Oath", desc: '+80% damage, but max HP set to 2', rarity: 'legendary', cap: 1, apply: (s, p) => { s.dmgMul *= 1.8; s.maxHp = Math.min(s.maxHp, 2); p.hp = Math.min(p.hp, s.maxHp); } }, secondskin: { name: 'Second Skin', desc: 'Revive once per floor at ½ heart', rarity: 'legendary', cap: 1, apply: s => { s.secondSkin += 1; } }, twinsidearm: { name: 'Twin Sidearm', desc: 'Bone Popper double-taps; specials burn 2× ammo', rarity: 'legendary', cap: 1, apply: s => { s.twinSidearm += 1; } }, crimsonmetronome:{ name: 'Crimson Metronome', desc: '+60% fire rate; every 8th shot costs ½ heart', rarity: 'legendary', cap: 1, apply: s => { s.rateMul *= 1.6; s.crimsonMetronome += 1; } }, abattoirengine:{ name: 'Abattoir Engine', desc: 'Pressure rises 2× faster; score and luck ×1.5', rarity: 'legendary', cap: 1, apply: s => { s.abattoirEngine += 1; s.luck += 0.5; } }, gorecrown: { name: 'Gore Crown', desc: 'Free nova on every kill, −25% damage', rarity: 'legendary', cap: 1, apply: s => { s.goreCrown += 1; s.dmgMul *= 0.75; } }, thousandteeth: { name: 'Thousand Teeth', desc: '+6 shards that can crit, −40% base bullet damage', rarity: 'legendary', cap: 1, apply: s => { s.thousandTeeth += 1; s.dmgMul *= 0.6; } }, hollowfather: { name: 'Hollow Father', desc: '3 damage-scaling orbitals, −25% fire rate', rarity: 'legendary', cap: 1, apply: s => { s.orbitals += 3; s.hollowFather += 1; s.rateMul *= 0.75; } }, thelastcut: { name: 'The Last Cut', desc: 'At ½ heart: ×3 damage, +1s immunity', rarity: 'legendary', cap: 1, apply: s => { s.theLastCut += 1; } }, meatgrinder: { name: 'Meat Grinder', desc: '12 dps aura within 90px, +1 damage taken per hit', rarity: 'legendary', cap: 1, apply: s => { s.meatGrinder += 1; } }, }; const ITEM_LEVEL_CAP = 9; function itemCap(iid) { return ITEMS[iid].cap ?? ITEM_LEVEL_CAP; } function romanNum(n) { return ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'][n - 1] || ('Lv' + n); } // ---- pools: hybrid weighted table, legendaries are boss-only ---- const ITEM_POOL_WEIGHTS = { elite: { common: 100, uncommon: 45, rare: 8, legendary: 0 }, room: { common: 45, uncommon: 85, rare: 40, legendary: 0 }, boss: { common: 12, uncommon: 45, rare: 70, legendary: 45 }, }; const ITEM_POOL_STICK = { elite: 1.0, room: 0.7, boss: 0.35 }; function rollItemId(source, floor) { const p = G.player; const w = ITEM_POOL_WEIGHTS[source] || ITEM_POOL_WEIGHTS.room; const f = floor || G.floor || 1; // distinct upgradable items owned, not yet at their own cap const owned = p ? Object.keys(p.items).filter(iid => (p.items[iid] || 0) < itemCap(iid)) : []; const stick = Math.min(0.5, owned.length * 0.10) * (ITEM_POOL_STICK[source] || 1); if (owned.length && chance(stick)) return choice(owned); // floor-scaled rarity table, boss-excluding legendaries from non-boss sources const floorScale = { common: Math.max(0.4, 1 - f * 0.05), uncommon: 1, rare: 1 + f * 0.08, legendary: 1 + f * 0.10, }; let total = 0; const weights = {}; for (const r in w) { const rw = w[r] * floorScale[r]; weights[r] = rw; total += rw; } let roll = Math.random() * total; let band = 'common'; for (const r in weights) { roll -= weights[r]; if (roll <= 0) { band = r; break; } } // candidates in the band that are not already capped let pool = Object.keys(ITEMS).filter(iid => ITEMS[iid].rarity === band && (p ? (p.items[iid] || 0) < itemCap(iid) : true)); // if the band is exhausted, fall back to any unmaxed item if (!pool.length) pool = Object.keys(ITEMS).filter(iid => p ? (p.items[iid] || 0) < itemCap(iid) : true); // absolute fallback: full pool (everything capped -> giveItem converts to score) if (!pool.length) pool = Object.keys(ITEMS); return choice(pool); } // legacy alias used by tests / older call sites function randomItemId() { return rollItemId('room', G.floor); } // duplicate pickups upgrade the item's quality (effect re-applies per tier) function giveItem(iid) { const p = G.player; const item = ITEMS[iid]; const lvl = p.items[iid] || 0; const cap = itemCap(iid); if (lvl >= cap) { addScore(150); spawnGems(p.x, p.y, 5); addToast(item.name + ' MAX', 'already mastered — +150 score'); Sfx.pickup(); return; } item.apply(p.stats, p); p.items[iid] = lvl + 1; if (lvl > 0) { addToast(item.name + ' ' + romanNum(lvl + 1), 'UPGRADED — ' + item.desc, 5.5); spawnText(p.x, p.y - 14, 'UPGRADED!', '#ffd060'); } else { addToast(item.name, item.desc, 5.5); spawnText(p.x, p.y - 14, item.name.toUpperCase(), ITEM_RARITY[item.rarity].color); } if (item.rarity === 'legendary') Sfx.curse(); else Sfx.item(); refreshOrbitals(p); } // spawn an item pedestal (item room / boss reward); source drives the pool roll function spawnItemPedestal(x, y, iid, source) { spawnPickup('itemspot', x, y); spawnPickup('item', x, y, { iid: iid || rollItemId(source || 'room', G.floor) }); } // ---- active items: room-clear charged, dedicated pedestal pickups ---- // Actives live in their own table so p.items (tier math + powerScore) stays clean. // charges are granted by recordRoomClear: +1 per combat room, +2 per boss. const ACTIVES = { bonenova: { name: 'Bone Nova', desc: 'Damage ring + hard knockback', cost: 2, use(p) { areaDamage(p.x, p.y, 150, 30 * p.stats.dmgMul, true, { source: 'player' }); for (const e of G.enemies) { const a = angleTo(p.x, p.y, e.x, e.y); e.vx += Math.cos(a) * 500; e.vy += Math.sin(a) * 500; } spawnShockwave(p.x, p.y, 150, '#e8dcc2', 0.8); addShake(8); } }, offalbomb: { name: 'Offal Bomb', desc: 'Gore bomb at the cursor', cost: 1, use(p) { explodeAt(mxW(), myW(), 95, 25 * p.stats.dmgMul, true); } }, bloodtransfusion:{ name: 'Blood Transfusion', desc: 'Heal 2 hearts, lose 25% current XP', cost: 2, use(p) { p.xp = Math.floor(p.xp * 0.75); healPlayer(4); spawnText(p.x, p.y - 16, '+2 HEARTS', '#d92038'); } }, cleaverstorm: { name: 'Cleaver Storm', desc: '12 orbiting cleavers for 6s', cost: 2, use(p) { p.cleaverStormT = 6; } }, butchersbell: { name: "Butcher's Bell", desc: 'Pull every enemy in and stun 1s', cost: 2, use(p) { for (const e of G.enemies) { if (e.boss) continue; const a = angleTo(e.x, e.y, p.x, p.y); e.vx += Math.cos(a) * 700; e.vy += Math.sin(a) * 700; e.stunT = Math.max(e.stunT || 0, 1); } spawnShockwave(p.x, p.y, 320, '#c9a227', 0.7); addShake(6); } }, marrowdraught: { name: 'Marrow Draught', desc: '+100% fire rate and free ammo for 5s', cost: 3, use(p) { p.marrowDraughtT = 5; } }, slaughtertime: { name: 'Slaughter Time', desc: 'Enemies at 25% speed for 5s', cost: 3, use(p) { for (const e of G.enemies) e.slowT = Math.max(e.slowT || 0, 5); } }, panicroom: { name: 'Panic Room', desc: '2.5s invulnerable, can\'t fire', cost: 3, use(p) { p.panicRoomT = 2.5; p.invT = Math.max(p.invT, 2.5); } }, skinnerscoin: { name: "Skinner's Coin", desc: 'Clear all enemy bullets into gems', cost: 3, use(p) { for (const b of G.ebullets) spawnPickup('gem', b.x, b.y, { v: 1 }); G.ebullets = []; spawnShockwave(p.x, p.y, 480, '#55f5dc', 0.5); } }, gutreroll: { name: 'Gut Reroll', desc: 'Reroll the pedestal you\'re standing on', cost: 1, use(p) { for (const k of G.pickups) { if (k.type === 'item' && dist2(k.x, k.y, p.x, p.y) < 120 * 120) { k.iid = rollItemId('room', G.floor); spawnText(k.x, k.y - 40, 'REROLLED', '#e2472f'); return; } } addToast('NO PEDESTAL', 'stand on an item pedestal to reroll it'); } }, }; function useActive(force) { const p = G.player; if (!p.active || (G.mode !== 'play' && !force)) return; const a = ACTIVES[p.active.iid]; if (!a) return; if (p.active.charges < a.cost) { addToast(a.name, 'not ready — clear ' + (a.cost - p.active.charges) + ' more room' + (a.cost - p.active.charges > 1 ? 's' : '')); Sfx.activeEmpty(); return; } p.active.charges = 0; a.use(p); spawnText(p.x, p.y - 22, a.name.toUpperCase(), '#e2472f'); Sfx.active(); } // spawn an active pedestal (boss / item-room bonus drops) function spawnActivePedestal(x, y) { spawnPickup('itemspot', x, y); spawnPickup('active', x, y, { aid: choice(Object.keys(ACTIVES)) }); }