I didn't notice any editing. Nevertheless, my tank will also defeat the second boss without any problems. Not only that, he will defeat every next one, only the first one, not
I cannot directly comment on why that is as the specific circumstances are not known to me, but thank you for bringing this observation to the table. We will be monitoring the damage dealt by the first boss closely following this patch.
Damage reduction skills like Shield of Discipline or the Warrior/Priests Barbarian Battle Cry work, if that was your question. This also includes the Warlock ISS or similar things. Direct increases of defense will have their effectiveness drastically lowered due to the increase in attack countering the increase in defense.
My question was if every skill in the game that reduces damage taken works for KS, I'm not just talking about the tank here. From my observations and also following this thread, it appears that this is not the case. A similar situation took place at hoto.
The only things that cannot be reduced in damage are certain damage over time debuffs and fixed damage. The only source of fixed damage in this instance are the muses which have direct counterplay to their flat damage. This consists of proper positioning or shielding.