Enemies with Darker Cores?

[Dan Maku]

What is the deal with non-Darker mobs with Darker cores on their bodies? Is there any bonus for destroying the core and not the mob?

[SpishackCola]

Those are boosted enemies, a feature carried over from PSZero. Just a bit tougher than their normal counterparts. I don't think there's a bonus for destroying the core, other than it counts as a weak spot usually.