The Ancient Magus' Bride - Vol. 9 Ch. 43 - The Road To Hell is Paved With Good intentions

[MangaDex]

 

[Liquidxlax]

So all that abuse from the villagers made him a bit crazy and then the addition of not being able solve cartaphilas's (or w.e) problem made him even more crazy which makes him do what one would think is a forbidden spell?

 

[Redsaint]

Thus they did the fusion dance and went on many merry adventures .
Jk they became even more batshit crazy and ruined the lives of countless people.