how about i shoot water/ice at the boos or maybe even i melt through the ground beneath him using fire so that he is hurt from falling.
shooting water is ineffective because it'll evaporate
ice might work
if he falls in the molten metal, he'll flame attack you right up the ass
Also I'm just going to laser out the ground out from under him.
Whoop wait no it's not a cutting laser
Oh well GAUSS RIFLE
cutting laser wouldn't work anyways, see above
and the rifle is just too big