FFG Twilight Imperium Twilight Imperium - Twilight Codex Vol. 2, Affinity EX
2, Affinity (EX). Twilight Imperium - Twilight Codex Vol. 2, Affinity EX. The Codex is a publication that highlights rules updates and showcases new content for Twilight Imperium: Fourth Edition and its Prophecy of Kings expansion.