ToME: the Tales of Maj'Eyal

Ok, so I realised the problem was that he spawned with 90% physical resistance and 9% all resistance. So I was dealing minimal damage to him with most of my attacks. So I swapped my mace to Stormlash and swapped my gloves with ones that had fire damage and after many turns of dealing 1% total health...

I went into the temporal rift and got to the chronolith twin. I beat the clone, but the twin seems actually impossible to kill. I can use every single attack i have and it will deal barely any or no damage whatsoever. The lowest I've gotten him is 91%, which he then healed back by putting up shields...