dervish heroes and flash enchantments?

I have MOX and Melonni as dervish heroes but I'm not sure how well they use flash enchantments.

I notice that they will have several flash enchantments activated during a battle (none of them are tear down skills because I like the damage they deal for the entire duration of the enchantment (Dust Cloak, Staggering Force, Heart of Holy Flame).

But my question is do all these enchantments have a stackable (combined) effect? Or is the most recent activated enchantment the one that counts? I'm thinking about reducing the number of enchantments in their skill bar if this is the case. Thanks.

None of thoose enchantments have any lasting effect except dealing Earth or Holy damage. Earth or Holy doesn't stack, only last activated enchantment will apply. Full effect on them depends on your other skills and type of foes (ie. Holy dmg against undead)