This is actually rather interesting. Based on the numbers given, you could do this to any full health guardian, no matter their armor stat. What I'm curious about is why it won't work if you aren't invis. The Khepris sting perk is that it does x6 damage to the back while invis. You clearly didn't hit him in the back, and even if you had, it would've killed him instantly. The only thing I see Khepris doing here is its poison effect, which you don't have to be invis to use. #TitanMasterRace