Übel Blatt started out promising but ended in a literal burning mess...
The story seems to be influenced by Berserk...a lot, expect betrayal, revenge, violence, rape and fantasy monsters. But somewhere in the middle of the story Übel Blatt seemed to ditch the adventure story to focus on war. And this is where you start to lose grip on the story. It becomes messy, hard to follow as there are constant explosions and battles.
And the more you go towards the end the less is being explained and the story becomes less coherent. Magically monsters and weapons appear out of nowhere without ever seen it before. And Koinzell/Ascheritt constantly switches between mortally wounded and being kick ass cool/strong. Berserk suffers the same fate of wounded protagonists but Koinzell's wound have even less impact as he can get right back up within seconds when the story needs too.
And once you read the final volumes the story becomes more and more rushed.
Overall this was a fun read at the start but kind of a choir to go through the second half. Still an okay read just because of the first half. If you want something better, I suggest you try out Berserk instead.... even though that manga will never end.