|This is an Enemy-only Servant. It cannot be obtained as a playable-Servant through any means.|
|Active Skills||Passive Skills||Noble Phantasm||Ascension||Skill Upgrade||Bond Level||Biography||Trivia|
Testament is the true final boss of the Prisma Causeway Event. She is an NPC-only Caster Class Servant.
Similar in-game to Illyasviel von Einzbern, she has several differences to her playable counterpart, such as having different skills, different Noble Phantasm name and a more corrupted look.