User blog comment:Linathan/Squad Spotlight: Trial X2/@comment-26336535-20150507002943/@comment-26140304-20150507003609

Ultor does not mitigate damage as he applies a Def buff to himself. Fixed attacks are the only attacks that deal a set amount of damage, regardless of Def, hence the name "fixed attacks". With Ultor's Def buff, Ultor's Def becomes high enough for him to tank a bunch of hits. He barely takes damage from the attacks that the maidens do, except for fixed damage.