I destroyed the gem four times now, but everytime I do, I get killed afterwards. I throw a grenade at the gem, then the gem gets boomed and a cinematic starts. In the cinematic I see one of the flying flames rape my character and then the game just kinda bugs.
After I throw my grenade onto the gem I try to run so that I will dodge any flames incoming, but I can hardly run because the cinematic starts very soon.
Anyways you said this is also the end of the map so it doesn't really matter, but I didn't know that so that's why I tried to kill the gem and live 4times in a row, wasting a bit of my time :). But np, twas fun. Rune puzzle easy :P.