Luminous skill build + other questions

I don't know if that ability is even in KMS, but if that is a difference between GMS and KMS that makes it that much more powerful (like the rest of the skills [340% damage per hit with Spectral Light? Really?]), then yeah... GMS is stupid.

Either way, I think it's based on damage. 1% of your damage going to HP and MP?

I watched carefully, there is no MP healing at all (it's 1% HP only, dark or light). It's just that the quests pretty much all level you up, which heals 100% MP, so you only need to do 1-2 quests per level.