Because he's on his own...

*SLAM*

"WHAT'S UP YOU LAZY WEAKLINGS?! GUESS WHO WORKED HIMSELF TO DEATH AND IS BACK FOR MORE!?"

The door to the adventurer's guild was kicked open so heard they got stuck in the walls on both sides, and a blue undead walked in with his hands up as if he was a least a messiah descending from the heavens to save the world.

"!!!!!!!!"

A monster waltzing in the building full of contracted monster hunters ended as one would expect it would – with everyone instantly reaching for their weapons and attacking.

...which made the undead grin so wide that his face looked as if it split apart...

…

…...

"Whew, that was a nice training – thanks, everyone! My close combat skill got to level 2 – and it's all because of your contribution!"

Zombie declared in a grateful voice as he took out a handkerchief and started wiping off the blood from his hands and elbows.