I attacked him with Kage, removed the minion and dispellable buffs.
I used Odin, who hit all including Krampus.
I used Drake, who hit Krampus again.
I matched tiles that hit Krampus, and turned into a cascading mess. For the record, he was hit by 3 sets, a total of 6 separate tiles.
I then checked his health level, and the D is at +94%, or 5 10% increases from the initial 44%.
I dont know what is counted as a hit, as in each attack, each tile, each group of tiles, each turn, whatever… but nothing in what I did adds up to 5 that I can see. Would be helpful to know what constitutes a “hit”, and then figure out why the count doesn’t seem to add up.