This article is for the Craft Essence. For the NPC-Only Servant, see The Black Grail (Servant).
Prior to bug fix before 14 Oct 2015 patch Official Bug Fix Maintenance :
- This Craft Essence's in-game description said it increased NP performance by 60%-80%, but it's increased by 50%-60% instead. Already Fixed at 14 Oct 2015 patch.