Dusk, Dawn and Twilight

Casting Shadow spells grants you Umbra, and Holy spells grants you Lumen. Casting Ebon Dawn or Holy Fire consumes these stacks. Consuming 5 Lumen stacks grants you Dusk, increasing Shadow damage by 10% for 8 sec. Consuming 5 Umbra stacks grants you Dawn, increasing Holy damage by 10% for 8 sec. Consuming 5 stacks of both grants you Twilight, increasing both Holy and Shadow damage by 12% for 10 sec.