Quote Originally Posted by Blueyes View Post
Oh I'm pretty sure the physical part of Mountain Buster is only relevant within Masked Carnival. Looking at Drill Cannon as an example, its ability description states that it deals unaspected damage, but its description within the spellbook will state that it deals physical and piercing damage with no mention of magic damage. We know Drill Cannon is buffed by Off-guard. I would have to test alongside a Dragoon friend to verify if it's also buffed by Disembowel, but I'm skeptical.
Physical damage is relevant.

Not for Off-Guard, because Off-Guard just buffs all damage you deal (Except the fixed damage of 1000 Needles).

Whether something is magical damage or not is relevant when it comes to Peculiar Light. Since Peculiar Light provides a magical vulnerability debuff, it does not have any effect on physical damage, such as that from Drill Cannon.