This is my second Demigod idea (he is based on another character of my creation). Please criticise to your heart's extent.

Name of Demigod: Lyrias

Type of Demigod: Assassin

General Description: Lyrias is a titanic demon being of immortal power, stretching void, fire and thunder to the extremes with his baleful summoning. Being hundreds of feet tall, Lyrias combines immense strength with an undying hatred for everything living. His very existence is a tortured whim, lightning rippling through his flaming skin; and the dark of corruption poisoning him like a furious snake. His existence of unbeing survives only for one reason; to exact vengeance upon the mortals who chained him to this evil form. With dragon-wings, a sinuous tail and deathly red orbs of sight, the screaming maw of Lyrias has consumed many thousands; and shall do so until the nothingness of obliteration.

Abilities

Constant Ability: Like Queen of Thorns, Lyrias must 'morph' between his three elemental forms; corruption, fire and lightning to use their corresponding abilities. Each form has two abilities (aside from Morph) and a passive ability, although each form has a super power that can only be unlocked by completely investing in that form's super abilities, which locks out the other forms and their abilities; when this happens, points spent on abilities made useless can be refunded.

Ability 1: Ripple (*lightning*)-Lyrias' inflicts pain upon himself, causing electricity to ripple from his body like maddened waves.

Level 1: Ripple does 280 damage over 3 seconds, stuns all enemies for 1 second, deals 100 damage to Lyrias, has a minimal range and costs 400 mana. Level 3. Ripple now does 370 damage and costs 500 mana. Level 5. Ripple now does 480 damage, stuns all enemies for 2 seconds, deals 200 damage to Lyrias, has a short range and costs 500 mana. Level 8. Ripple now does 550 damage and costs 600 mana. Level 12. Ripple now does 800 damage, stuns all enemies for 3 seconds, deals 350 damage to Lyrias, has a medium range and costs 800 mana. Level 16. Ripple now does 1025 damage instantaneously, stuns all enemies for 4 seconds, deals 400 damage to Lyrias and costs 880 mana. Level 18. Ripple now does an additional 100 damage after the initial burst over 5 seconds. Level 19. Ripple now does an additional 200 damage after the initial burst over 5 seconds.  

Ability 2: Thunder Titan (*lightning*)-Lyrias pools his energies into his lightning powers, thus giving him a DoT effect and increasing his attack speed (passive ability).

Level 2. Thunder Titan gives Lyrias a 5 damage per second aura and increases attack speed by 2%. Level 5. Thunder Titan gives Lyrias an 8 damage per second aura and increases attack speed by 5%. Level 8. Thunder Titan gives Lyrias a 12 damge per second aura and increases attack speed by 8%. Level 12. Thunder Titan gives Lyrias a 15 damage per second aura and increases attack speed by 11%. Level 15. Thunder Titan gives Lyrias a 20 damage per second aura and increases attack speed by 15%. Level 18. Thunder Titan gives Lyrias a 40 damage per second aura, increases attack speed by 25% and disables all *corruption* and *fire* abilities. Thunder Titan also now gives a 2% damage boost and 10% mana cost decrease to all *lightning* abilities, unlocks Lightning Dirge.

Ability 3: Shock (*lightning*)-Lyrias snatches an enemy into his iron grip and fills them with his thunderous powers, electrocuting them.

Level 6. Shock does 500 damage and costs 600 mana. Level 12. Shock does 800 damage and costs 900 mana. Level 16. Shock does 1000 damage and costs 1050 mana. Level 18. Shock does 1300 damage and costs 1200 mana. Level 19. Shock now stuns the enemy for 2 seconds.

Ability 4: Lightning Dirge-Lyrias smites all surrounding enemies with a destructive electric discharge.

Level 20. Lightning Dirge does 1500 damage to all surrounding enemies, costs 1000 mana and has a 3 second charge-up time.

Ability 5: Reap (*corruption*)-Lyrias stabs an enemy with a clawed finger, filling them with his blood's natural poisons.

Level 1. Reap does 400 damage over 10 seconds and enemies can still move, costs 200 mana. Level 3. Reap now does 500 damage, costs 300 mana. Level 5. Reap now does 600 damage, costs 400 mana. Level 8. Reap now does 700 damage, costs 600 mana. Level 11. Reap now does 800 damage and enemies are slowed by 10% of their movement speed, costs 750 mana. Level 14. Reap now does 900 damage, costs 850 mana. Level 17. Reap now does 1000 damage, enemies are slowed by 15% of their movement speed, enemies have their attack speed reduced by 10% and it costs 950 mana.

Ability 6: Shadow Stalker (*corruption*)-Lyrias pools his energies into his corruptive powers, thus giving him a lifesteal aura and increasing his mana regeneration (passive ability).

Level 2. Shadow Stalker gives Lyrias a 50 damage lifesteal aura and increases his mana regen by 5%. Level 4. Shadow Stalker gives Lyrias a 70 damage lifesteal aura and increases his mana regen by 8%. Level 6. Shadow Stalker gives Lyrias a 90 damage lifesteal aura. Level 8. Shadow Stalker increases Lyrias' mana regen by 11%. Level 11. Shadow Stalker gives Lyrias a 100 damage lifesteal aura and increases mana regen by 13%. Level 14. Shadow Stalker gives Lyrias a 120 damage lifesteal aura and increases mana regen by 15%. Level 18. Shadow Stalker gives Lyrias a 150 damage lifesteal aura, increases mana regen by 20%, now gives a 30% lifesteal effect to all *corruption* abilities, disables all *fire* and *lightning* abilities and unlocks Night Rift.

Ability 7: Syphon (*corruption*)-Lyrias steals the magical energies of surrounding enemies for his own intricate intentions. 

Level 3. Syphon steals 100 mana from each enemy nearby in a medium radius at a maximum of five enemies. Level 7. Syphon steals 120 mana from each enemy nearby. Level 10. Syphon steals 140 mana from each enemy nearby. Level 13. Syphon steals 150 mana from each enemy nearby in a large radius. Level 17. Syphon steals 160 mana from each enemy nearby at a maxium of six enemies.

Ability 8: Night Rift (*corruption*)-Lyrias creates a massive rift in the plane of reality, causing the endless void to draw close enemies inside.

Level 20. Night Rift deals 2000 damage over 10 seconds, drawing enemies too close in and disallowing them from leaving, has a medium range and costs 1500 mana.

Ability 9: Flaming Smite (*fire*)-Lyrias smites an enemy with a flaming strike.

Level 1. Flaming Smite does 100 damage and refunds this as health for Lyrias, costs 150 mana. Level 2. Flaming Smite does 125 damage and refunds this as health for Lyrias, costs 250 mana. Level 4. Flaming Smite does 180 damage and refunds this as health for Lyrias, costs 320 mana. Level 6. Flaming Smite does 290 damage and refunds this as health for Lyrias, costs 400 mana. Level 9. Flaming Smite does 450 damage and refunds this as health for Lyrias, costs 550 mana. Level 12. Flaming Smite does 580 damage and refunds this as health for Lyrias, costs 670 mana. Level 14. Flaming Smite does 650 damage and refunds this as health for Lyrias, costs 720 mana. Level 16. Flaming Smite does 820 damage and refunds this as health for Lyrias, costs 860 mana.

Ability 10: Furious Flame-Lyrias pools his energies into his burning strength, increasing his maximum HP and attack damage (passive ability). 

Level 2. Furious Flame increases HP by 100 and attack damage by 2%. Level 3. Furious Flame increases HP by 110 and attack damage by 2.5%. Level 4. Furious Flame increases HP by 125 and damage by 3%. Level 6. Furious Flame increases HP by 180 and damage by 3.5%. Level 8. Furious Flame increases HP by 215 and damage by 4%. Level 10. Furious Flame increases HP by 300 and damage by 4.5%. Level 12. Furious Flame increases HP by 330 and damage by 5%. Level 16. Furious Flame increases HP by 550 and damage by 7%, now gives an additional 10% HP regen, disables all *corruption* and *lightning* abilities and unlocks Chasm Candle.

Ability 11: Wisp of Rage-Lyrias contorts into greater flames, making him tougher and harder to strike (passive ability).

Level 4. Wisp of Rage gives an 8% evade chance and increases armour by 100. Level 12. Wisp of Rage gives a 14% evade chance and increases armour by 250. Level 18. Wisp of Rage gives a 20% evade chance and increases armour by 400.  

Ability 12: Chasm Candle-Lyrias draws into himself, then bursts into even more intense flames; draining his power but making him an unstoppable titan of wrath and annihilation.

Level 20. Chasm Candle doubles Lyrias' attack damage and increases his HP by 25% for as long as his mana lasts, meaning he loses 100 mana per second. Casting time is 5 seconds.

Notes: Lyrias can play one of three personalised roles (dps, lifesteal and toughness in order) and receive the full benefits of one tree whilst sacrificing the other two power trees, or he can generalise between all three and invest equally, or more of two and less of one, and so on. In this way, he is very customizable and can suit different roles for different types of people. If you want less survivability but more intense damage, you go for all out lightning. If you want superb regen for both mana and health and alright abilities, you typically want corruption. And if you want to be an unstoppable juggernaught that can withstand endless punishment with an amazing super ability, you go for fire. Lyrias is intended to be high damage and high health as it is, though he has almost no armour to start off with and little in the way of regeneration; as per his race's qualities. Like the Rook, he is amazingly difficult to beat when he reaches his full potential, but can be very vulnerable earlier on. One must play very carefully as Lyrias, and know exactly what they need/want for the fight ahead; picking the wrong power tree could prove to be disastrous for your team. Lyrias is bigger than the Rook, and his default form is corruption. Note that whilst having the ultimate stat boost ability for each power tree will lock out the other power trees, you can still morph into the other forms if you really want to. Lyrias is very slow, more like an actual titan than the Rook, and slower overall to compensate for his increased base damage and health. He can be very mana dependant, and unless you go for the corruption tech tree it is very likely you will run out of mana very quickly.

I can also write a backstory for him (as well as the other submitted character Furion) if this idea is ever put to use by anyone.