Atai'natha by HexerVoodoom

Casting abilities generates Elemental Power.
Activate to consume 3 elemental power and cast an Elemental Blast based on the powers consumed. Elemental powers also grants bonus based on how many stacks are active.

Fire Power - increases Elemental Blast damage by 30% per Fire Power; Increases Atai'Natha's ability damage.
Earth Power - Elemental Blast stuns for 0.5 seconds per Earth Power; Increases Atai'Natha's physical armor.
Thunder Power - Elemental Blast jumps to 1 nearby enemy per Thunder Power, causing 50% of damage; Increases Atai'Natha's atk speed.

Deals single target fire damage.
Generates 1 fire power

Causes the earth to treamble, dealing damage and stunning for 0.5s every 1s over the terrain. Lasts 3s.
generates 1 earth power

Blast thundering powers in a cone in front of the caster, causing damage and slowing affected enemies.
Generates 1 thunder power

At level 1 you must pick 1 out of 3 totens
Option 1
Channels a powerful thunder on targets affected by Magnetic Discharge.
Casting magnetic discharge near this totem generates 1 extra thunder power.

At level 1 you must pick a totem
Option 2
Generating or consuming Fire Power causes the totem to release a fiery energy, damaging nearby enemies.
Casting Lava Burst near this totem generates 1 extra fire power.

At level 1 you must pick a totem
Option 3
The totem removes a stun on nearby allied hero, detroying itself in the process.
Casting earthquale near this totem generates 1 extra earth power.

Level 10
Consumes your elemental power to summon and mount an Armored Elemental Direhorn to fight alongside you for a few seconds. Requires all 3 elemental powers to be the same. The elemental power consumed determines the direhorn's powers.
Fire: basic attack damage increase. Has Burning Rage.
Eart: Increased physical armor. Every third basic attack stuns.
Cold: Increased magic armor. Chill Aura, slowing enemies.

Killing the elemental beasts does not kills the rider.

Level 20
Summons an Armored Elemental Devilsaur instead.

Level 10
Calls upon the wrath of the forgotten loa of thunderstorms, A'gal, The Violent.
Passive: Basic attack damage is increased. Every third basic attack generates Thunder Power.
Active: Greatly increases basic attack speed for a few seconds and causes basic attacks to connect.

Level 20
Basic attacks reduces heroic cooldown. Also, Elemental Blast damage is increased by 50% but becomes melee.