Originally Posted by
Sutra
From what I've noticed they only attack if you match that color.
Like archangel Gabriel as an example, he's dual water/light. The light element only attacks if you match light orbs, and it's at a greatly reduced (maybe 50% or so?) compared to the primary color.
I think most of the dual color guys are normally used in dungeons where you need damage reduction, like the Greek gods who halve damage from their element plus light or dark depending on the ultimate evo you choose.