Graviturgist – Wizards that can adjust gravity, weight, and density of creatures and objects. It’s important to know the limit of the electricity as these Wizards are more support than entrance liners. 

Solar Soul – The subclass strikes and blasts w

Clerics don’t get either from the Duergar’s innate spells, but they are able to’t target other creatures along with other creatures will advantage over you, so there’s minor appeal there. The Duergar’s defenses are good, but only situationally useful.