Talk:Bedivere/@comment-34750476-20181202124348/@comment-27971189-20181202125912

Grail is indeed, only for those you wanted to be stronger, especially favorites.

Or if you didn't have / think you're lacking a Lv. 90 Servant on certain class, maybe because its small pool like Lancer or Assassin, so you use Grail to compensate that.