[quote=@ihinka]
Hm... I might try for a Witch or a Fragment character, but I wanted to ask first. Do the Fragments need to consume other fragments, or is it that they simply can to become more powerful?
[/quote]

They don't need to to survive as such, no, a Fragment can just keep on indefinitely without doing so. Some, though not all, feel a strong urge or instinct to do so.