Death Dauber is only a tad difficult compared to several other enemies due to its annoying Sleep Needle, but it is still of no threat, even in Oversoul. Physical attacks is more than enough to take it down.
In the Fiend Tale endings, a notable Death Dauber named Buzzer was bullied in both life and death, and desires to become stronger. In time, Buzzer realizes what he needs is courage and faces his bullies, Iron Giant and Hrimthurs. Though he lost, Buzzer won the respect of a boy who faced his own bullies soon after.