several versions of Shadow Kresovus are found in the Prodigal Lugian quest.
Spells cast: Flame Chain, Force Wave, Lightning Wave, Dark Vortex, Dark Lightning, Big Fire, Heavy Lightning Ring, Heavy Force Ring, Gossamer Flesh, Inferno's Gift, Astyrrian's Gift, Tusker's Gift, Gravity Well, Wrath of Harlune, Wrath of the Hieromancer, Essence Void