Fought the Grym and i encountered a bug (tried it twice)
1. I planted Lae'sel on the left side with a Maul (looking at the lava opening),released the lava with another toon, Grym comes out (cut scene) and lava is there but Grym is not super heated and the lava disappears quickly, No chance to do any damage to him by Lae'zel. Tried it twice and had same result.
It plays out as expected when everyone is positioned around the circle (killed him but it was rough)
There is a bug there under certain circumstances, don't know if it was there in EA as I didn't play that far in EA