Quote Originally Posted by tuggyne View Post
Really? HEAT works by forcing a very high-speed jet of solid metal through other solid metal by means of sheer kinetic momentum; any heat formed is purely incidental and irrelevant to the penetration (though it's certainly handy once you get through).

In 3.5 terms, HEAT is piercing damage that ignores hardness up to a certain amount, with auxiliary sonic, fire, and maybe slashing components.
I'm aware of how a HEAT round works, thus the comparison. In 3.5 I'm sure you could classify a HEAT round like that, but a relatively realistic take on fantasy could certainly treat bolts of fire (seriously its a blast of fire that hurtles through the air and impacts a target). That sounds like the way a HEAT round works, at least at a basic level.