Why does KRU take reduced damage from percentage health effects?

DoT: Damage 5% Max Health
Kylo ignore this percentage. I think almost not damaged by DoT.
When Kylo use his special then he gets DoT.
Only case that I saw kylo is dead by DoT is at STR.
When his health becomes 1 by Traya’s raid ability durin other allies turn, then he will be dead by DoT.
I think he almost ignore DoT effect unless his health is almost zero.
KRU is same. But Scarred gave him health recovery. So, when plague, burning or DoT affects for KRU, then he recovers 8% health “immediately(maybe like Zarriss)” for each effect.