Talk:Sieg/@comment-34364075-20180430065920/@comment-27971189-20180501130505

He has that good mana pool from beginning as he's intended to be mana battery of Black Faction, similar to Illya who strong enough to handle Herc.

Siegfried heart contribute to his accelerated growth as the heart shaping him into Siegfried 'clone'. In anime, you can see he became taller and his pale white skin became darker.