I noticed he went down to one knee after one hit from a warmonger on Adept , which was strange for him since i smithed him legendary ebony armor and enchanted it , he was usually alot more resistant being able to take a few blows before using a.potion i had given or me healin him and he.still had three potions on him when he fell.
i would say it was me that killed him because when he went down those two.warmongers came after me so i switched to chain lightning " im a battle mage " , BUT i enchanted Farkas's armor with lightning and fire resist for when i use my spells and he had been resisting. Plus i thought he was essential....and everywhere i looked online said he was to.
So what happened?