Is it really possible to be this strong?

But AFAIK in KMS it doesn't work like that, Sunfire shouldn't give +50% Dmg, just the ability to gain HP while attacking. And NexonAM decided to give both skills the % dmg buff.

Late for the party, but anyway for KMS, Light = +50% damage (the more-lines Shadow Partner way) and heals 1% HP (I think it's HP-based) for each attack. For Dark, it is +50% damage and 0 MP cost. Equilibrium is, obviously, both cases, though I can't remember if 0 MP applies to Light skills as well during Equilibrium.

Hadriel