Zerg Larva by Vynadrian

The Zerg larva has a second Talent Tree, granting it access to Evolutions at levels 1,2,4,6,8,10,12,14,16,18 and 20. To Gain Biomass you simply collect it from killing Minions, Captured Mercenaries and Bosses and Enemy Heroes. You gain Biomass from proximity, meaning, if you are close enough to collect XP you will gain Biomass.

Your level 1 Evolution costs no Biomass and does not raise the Cap, however the next Evolution costs 50 and raises by 15 each Biomass Level (i.e. levels 1,2,4,6,8,10,12,14,16,18 and 20). Upon Death, all Biomass collected towards your next level will be lost but now your Current Biomass Level.

The Evolution will increase Movement and Attack Speed by 50% for 5 seconds.
Cooldown: 12 seconds.

This Ability is retained after Evolving.

The Zerg Evolution will Leap to a targeted Enemy Hero dealing 66 (+4%/level) Damage and causing all of the Evolution's Basic Attacks within 3 seconds to deal 100% increased Damage.

This Ability will be Lost upon Evolving.

Basic Attacks deal 20 (+5/level) damage over 3 seconds. If an enemy dies while under the Effect they will spawn 2 Roachlings.

Roachling Statistics
Health: 40 (+4%/level)
Damage: 18 (4%/level)

This Ability will be Lost upon Evolving

The Evolution will launch a large Projectile dealing 102 (3%/level) and 46 (+3%/level) over 3 seconds and slows the target by 60% decaying over 3 seconds.
Charges: 3.
Recharge: 5 seconds.

This Ability will be Lost upon Evolving.

The Evolution launches 3 Glaives in a cone dealing 45 (+4%/level) Damage to primary target's and bouncing up to 2 additional targets dealing 50% damage.
Charges: 2.
Reacharge: 8 seconds.

This Ability will be Lost upon Evolving.

The Evolution goes into Stasis for 2 seconds, evolving into an Ultralisk the size of Stitches, increasing it's Healthpool by 1,350 (+5%/level), Basic Attacks deal 40% increased Damage and Cleave for 100% of that Damage.  Ultimate Evolution: Ultralisk may be reactivated to Stampede in a direction dealing 150 (+5%/level) damage to all enemies hit and stunning them for 0.50 seconds. The Ultralisk also takes 50% less Damage from Non-Heroic Targets and lasts for 16 seconds or until killed.
Cooldown: 80 seconds.

The Evolution will instantly Burrow and reemerge after 1 second as a Nydus Work stunning Enemies by 0.75 seconds, knocking them back and dealing 286 (+5%/level) damage and diving again at a targeted location dealing 420 (+4%/level) damage and stunning enemies for 0.50 seconds. The Evolution has 4 seconds to use the Dive Ability and if they do not use it the Nydus worm will Burrow at its current location dealing no Damage or Stun and after a 1.5 second delay the Evolution will reemerge in its last Zerg Strain.
Cooldown: 100 seconds

Permanently remain in the Ultralisk Evolution and grants a 75% reduction in the duration of disabling effects. You can now Burrow as Ultralisk.

Ultimate Evolution: Nydus Worm's Cooldown is reduced by 30 seconds and if a Hero is standing within a small radius in the center of the Dive they will be placed into a stasis for 1.5 seconds before reemerging alongside the Evolution at the cast point.

After a 1 second Delay the Zerg Larva will Burrow itself beneath the surface becoming unable to be targeted and Invulnerable until resurfacing.
Cooldown: 16 seconds.