Extend Basic Nexus Kull to Ixian factions

docs/NEXUS_CARD_RULES.md

@@ -877,6 +877,23 @@ the Cheap Hero identity. Other rosters, nested effects, complete games and
 deployed acceptance remain open. The later public Semuta entry below removes
 the stated Emperor and Sapho blockers for its narrower CHOAM-only Basic scope.
 
+## Basic Ixian Nexus Kull and Sandtrout — 30 October 2026
+
+**Prototyped / Partial.** Fresh Basic Nexus games with CHOAM, Ixians and/or
+Tleilaxu and the Ix and CHOAM decks now enable the existing Kull preview by
+default, with host opt-out. An Ixian Bidding attempt retains its native
+response through printed or Nexus-fueled Kull, a distinct counter or decline,
+and the subsequent Ixian Nexus decision and auction. An unallied holder of
+the Emperor Nexus can also use its existing ordinary bank-auction benefit
+while Sandtrout is waiting; the original purchase and revival controls remain.
+
+Public-start fixtures use genuine Nexus and Sandtrout draws and actual auction
+and response actions. Unopened card order, earned Nexus identities, physical
+card custody, force positions and revival Tanks are staged. The existing
+provisional Kull response ordering remains. Richese/Semuta with Nexus Kull,
+other modules, Emperor seller/Ambassador purchases during Sandtrout, wider
+nested effects, complete games and deployed acceptance remain open.
+
 ## Basic native Nexus reactions and Kull — 30 October 2026
 
 **Prototyped / Partial.** Fresh Basic Nexus games with selected Ix and/or