I would say you are abusing game mechanics right there
Yea but I just picked an old save just for this video and killed him with seals On my "real" story I killed him with Paladin ( my self) Durance, Aloth, Edér, G.Mother and Sagani after I got the scale breaker skill as I said in my post, had some summons, food, scrolls and potions to help as well.