Unstable [T]. At the end of the turn (after gaining stamina), roll one dice for each point of stamina on the model. If any 6s are rolled then pressure has gone critical. The KalGush may choose to Vent immediately, but must then roll again for all stamina on the model. If any sixes are rolled then the weapon explodes and all models in 1" must make a tough save (possibly this should be 2"?).
So to clarify that;
Say I have three stamina, I roll two threes and a six. I can then either explode, or gain a re-roll of ALL dice by venting?
I'm also still a lil' concerned that 2CS base is kinda low, that means that to get to the stage where you have a better attack than the derak you're looking at a 1/3 chance (2 stamina) of rolling one of those deadly sixes. This is shaping up to be a beautifully characterful weapon though, I'm loving the feel of the rules.