Hello.
My idea :
Extra notes :More spellcaster than damage dealer, although he can deal good damage. He gains mana by devouring souls... Ok?
Title : Devourer
Username :Herian
Abilities :
First ability : Devour Soul AUTOCAST
Icon : Orb of annihilation.
Graphic : Drain mana.
The devourer devours the soul of an enemy, stunning him for seconds, and dealing damage. Also gives mana.
Level 1: 100 damage. 1 second stun. 20 mana.
Level 2: 150 damage. 1.5 second stun. 30 mana.
Level 3: 200 damage. 2 seconds stun. 40 mana.
Level 4: 300 damage. 2 seconds stun. 60 mana.
Level 5(Max): 400 damage. 2 seconds stun. 60 mana.
Second ability :Shake and Tremble
Icon : Earthquake
Graphic : Earthquake/Volcano.
The Devourer uses up all his mana to create a powerful "Ground annihilation". It spawns some orbs of souls or "soul gems" in areas around him. After 1 second, the orbs launch an earthquake around them, to make the enemies tremble while the ground shakes at their feets.They recieve damage and get slowed.
Level 1: 2 orbs around. 50 damage. Slow for 3 seconds.
Level 2: 2 orbs again. 75 damage. Slow for 5 seconds.
Level 3: 3 orbs. 100 damage. Slow for 5 seconds.
Level 4: 4 orbs. 125 damage. Slow for 5 seconds.
Level 5(Max): 4 orbs. 200 damage. Slow for 5 seconds.
Third ability :Fiery Soul
Icon: Flame Strike
Graphic: Immolation
The Devourer's soul is icy. When this spell is cast, his souls becomes fiery as hell..He gains bonus mana regeneration, and bonus attack speed, but can't cast spells until the boost ends.
Level 1: boost for 4 seconds ; gains 25% bonus regeneration and attack speed
Level 2: boost for 4 seconds ; gains 30% bonus regeneration and attack speed
Level 3: boost for 5 seconds ; gains 40% bonus regeneration and attack speed
Level 4: boost for 6 seconds ; gains 50% bonus regeneration and attack speed
Level 5(Max): boost for 7 seconds ; gains 50% bonus regeneration and attack speed
Ultimate ability :Dance of Spirits
Icon: Black recolored flame strike..
Graphic: Wisps around him, the sonic waves can be something windy.
Devourer uses up all his mana to cast his final spell. His final move...His final dance : The dance of Spirits. He releases the souls he caught, and make them turn around him. Every second, the dancing spirits stop, and cast a bit powerful sonic waves around them. The waves deal 150 damage to all nearby enemies. Then they move again. Every 4 waves, one of the souls disappear. The devourer may not do anything while the spell is cast besides attacking (not casting spells or moving). Also give him the attachment "Fire". around him, or spheres if it works with all heroes (the effect Blood Mage got).
Level 1(Max): 1 soul for every 30 mana. The more souls, the more powerful the spell is (not more damage, or something..

)250 AoE waves.
EDIT: Model : Medivh..