Egrein by TimeLord

Level 1:
Wereform Form (D): Shapeshift into a Werewolf, gaining 30% increased attack speed.
Werebear Form (D): Shapeshift into a Werebear, gaining 30% increased attack damage.

Level 4:
Ruthless Vine (W): Quest: Damage 30 enemies with Poison Creeper. Reward: Poison Creeper also Roots enemies for 0.75 seconds.
Lycanthropy (D): Gain 10% increased movement speed in Werewolf form and 10 Armor in Werebear form.
Feral Lunge (D): While Shapeshifted, your basic attacks cause you to lunge at enemies from a short distance.

Level 7:
Freezing Cold (Q): Quest: Damage enemies with Arctic Blast for 80 seconds. Reward: Increase Arctic Blast's damage by 50%.
Beast Charge (Q): Increases the jump range of Fire Claws by 25%.
Cracked Earth (E): If Fissure hits at least 2 enemy Heroes, its cooldown is reduced by 3 seconds.

Level 13:
Solar Creeper (W): Poison Creeper restores 1.5% of your max Mana with each attack.
Sunder (E): Increases the area of Fissure by 30% and duration by 0.5 seconds.
Bloodthirsty (D): While Shapeshifted, basic attacks heal you for 20% of the damage dealt.

Level 16:
Polar Winds (Q): Increases the length of Arctic Blast by 20% and the slow by 10%.
Animal Rage (Q): Fire Claws now applies to next 4 basic attacks and increases your attack speed by 20%.
Wild Growth (W): Poison Creeper gains another charge, but its cooldown is increased by 2 seconds.
Wild Fire (E): Damage of Fissure increases by 15% each second.

Level 20:
Infection (R1): Increase the poison damage of Rabies by 100%.
Grizzly Strength (R2): Increase the stun length of Maul by 0.5 seconds and reduce charge cooldown by 10 seconds.
Armageddon (R3): Volcano also fires molten boulders that damage enemies upon impact.
Full Conversion (D): Remain Shapeshifted permanently, gaining another 10% movement speed in Werewolf form and another 10 Armor in Werebear form.