this is just an idea that might not fit with destinys lore, But~
why is coldheart an arc weapon?? to match the color? lol
solar damage should be changed to thermal and include coldheart and any other guns you think of
its silly that a "cold laser beam" is electrical damage
Coldheart is cold fusion based i believe. So that fusion creates energy, in this case, arc energy, to use as its ammo.
The beam itself is not cold, the core of the gun is though, because of the cold fusion.
Read about it. Hold (L2?) on the inspect screen for it and lore pops up.