Responses
Think about the fact that he is constantly, every second, of everyday, keeping a literal god (I can’t remember but it might even be two gods) sealed. That’s why he constantly loses mana and has to take those pills, it’s also the reason why the god began to escape when he wasn’t able to have the pills. Just thinking about that shows that his mana quantity is freaking mind blowingly large and his spell knowledge and power is just as impressive. (btw this isn’t a spoiler, it’s just gathered from context clues we’ve been given in the story so far)
JUST HOW STRONG IS RUDIGER THE MAN USED YESOD NINTH TREE OF THE SEPHIROTH LIKE IT WAS A SPRINT IN THE PARK (bc its probably gonna fuck him over afterwards but still, he can use it)