I need help with getting a subclass ability to function right. At level 14 I get to do a special melee attack that does 3d8 thunder and 3d6 fire damage. Here's the problem. Diving up the damage types is easy but for some reason it add my stat modifier to the dice rolls when it's not supposed to be.  For the melee attack yes I get my modifier not my for damage roll. I can't figure out how to fix this. I've noticed similarities between what I want and how the other part of the spell "Wall of Light" functions where you can use your stats to make an attack roll but the stats don't get mixed in with the dice roll. Anyone have any ideas?

All “weapon” and “spell” actions are programmed to do that. You would have to set it as a “general” action, but that might have other unintended consequences that I am unaware of. If it makes you feel any better, the devils have the same problem, which is why not all of the Artillerist’s  turrets display is attacks. I know that they are working on fixing all of this stuff, but nobody knows how long it’ll take.

Setting it to General works for the damage roll. I just set it to a three part workaround. Thank you for the help!