I'm not sure about this, but it might be because of his Spoil Victor.
Spol Victor, For 5...17 seconds, whenever target foe attacks or casts a Spell on a creature with less Health, that foe loses 25...85 Health.
That damage ignores Protective spirit and armor so it might be that. Are you using a 55 build? If you are, then try to kill him when he's above 55hp, somehow.
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