Ormorok the Tree-Shaper is an elemental boss living in The Nexus. He is probably the one who created all the Crystalline treants and ancients to guard the way to his chambers.
Trample: Inflicts normal damage plus 2357 to 2643 to nearby enemies.
Spell Reflection: Magical spells will be reflected. 4 charges.
Crystal Spikes: Summons a series of crystal spikes that radiate out in all directions from the caster. After a short time, they will erupt from the ground, dealing 2828 to 3172 damage to all nearby enemies and knocking them into the air.
Frenzy: At 25% Health he enrages increasing his damage by 100%