Twinkle Fortress (煌要塞, Kō yōsai) is "Finisher Skill" type of Keyword, belonging exclusively to The GlacierGodKing Avalanche-Bison Type-0, the Advent-based retrain of The OxTwelveGodKing Avalanche-Bison. The original effect protected refreshed God-Kings and Ten Crowns from effects [During Seal] while this version protectes refreshed [During Advent] Spirits while Bison itself is [During Advent] as well.