I think that guy killed all other npcs that were at sanctuary, except for ione and vrael, tried to kill him before dying he says "you were a wolf after all".

Or they all died because of level of fear

Has alternate dialogue if you cancel your contract with death if you are trying for a no death run. He smells you out and mentions you are untainted and worthy

All of them? Even Ione?

I killed him when he killed the covenant knight. After that he dropped a Dark Leather boots (+3) vIT +5 fIN +9

All dem npcs disappeared wtf

Killed him before the Sanctuary, dropped an aura.

Bast can drop Dark Leather Boots +3. It's a random drop, so there are no requirements beside your luck.

pqp eu queria os npc vivo e não sabia pq estavam morrendo, vai toma no cu Bast