Mana

Blue Mana
Blue Mana is ammo for Serpent Staff, Timon's Axe, Frost Shards and it's Ammo Number 1 for Quietus,Wraithverge and BloodScourge.

Green Mana
Green Mana is ammo for FireStorm, Hammer of Retribution, Arc of Death and it's Ammo Number 2 for Quietus,Wraithverge and BloodScourge.

Combined Mana
Combined Mana it's nothing than Sphere that's when is picked up, picker got 20 of each Blue and Green Mana.

Yellow Mana?
Yellow Mana can be found in Hexen : Carnage Galore : Fury of Vuradi.