Xaril by Nortin

Tier 1

Paragon's Purpose - Whenever an enemy dies while affected by Toxic Injection, Xaril deals 10% more damage and receives 50% increased Mana regeneration for 1 second per stack of Toxic Injection they were affected by. Duration, but not effects, stack.
Crystalline Vial - Catalyst's projectile speed is increased by 50%, and its radius is increased by 15%.
Python's Coil - Serpentine Strike also Slows the movement speed of enemy heroes by 10% for each time it hit them, decaying over 2 seconds.

Tier 2

Caustic Blood - Enemies receive 15% less healing while affected by Toxic Injection. Additionally, Toxic Injection lasts indefinitely on enemy heroes below 5% of their maximum Health.
Venomous Flurry - Reduce Envenom's cooldown by 0.75 seconds each time it hits an enemy hero, up to 3.5 seconds maximum.
Tenderizing Strikes - Xaril's basic attacks reduce his target's Physical Armor by 2 for 4 seconds, stacking up to 5 times. However, Xaril's basic attacks do not receive increased damage from this.

Tier 3

Firebloom Toxin - Whenever Xaril applies Toxic Injection to an enemy hero, they burst with burning toxins, dealing 16 (+4% per level) damage to them and all nearby enemies per stack of Toxic Injection applied.
Red Catalyst - Catalyst now burns in its area of effect, dealing 22 (+4% per level) damage to enemies within every 0.5 seconds. Each time it triggers Toxic Injection's explosion effect, this damage is increased by 50% for the duration of the ability.
Briarthorn Toxin - Adds Briarthorn Toxin to the secondary ability bar.

Tier 4

Raining Blood - See above.
Volatile Reaction - See above.

Tier 5

Fadeleaf Toxin - Envenom and Serpentine Strike also grant Xaril Unrevealable for 0.75 seconds if they hit at least 1 enemy hero.
World Serpent - Serpentine Strike also heals Xaril for 2.5% of his maximum Health each time it hits an enemy hero.
Kingsblood Toxin - Adds Kingsblood Toxin to the secondary ability bar.

Tier 6

Bloody Explosion - When an enemy reaches 10 stacks of Toxic Injection, they immediately take damage equal to 5% of their maximum Health.
Purple Catalyst - When Catalyst triggers Toxic Injection's explosion effect on an enemy hero, they lose control of their hero and are forced to run forward for 1 second.
Bloodthistle Toxin - Adds Bloodthistle Toxin to the secondary ability bar.

Tier 7

Angel of Death - If Raining Blood's second strike or the subsequent explosion kills its target, reset its cooldown.
Paralytic Fumes - Volatile Reaction's fumes now Stun enemies for 0.25 seconds for every 2 seconds they remain in it.
Deadly Sting - After applying 12 stacks of Toxic Injection to enemy heroes, Xaril's next basic attack will trigger Toxic Injection's explosion effect on its target based on their current amount of stacks.
What Doesn't Kill You... - While taking self-inflicted damage, Xaril receives 15 Armor. Whenever an active Toxin wears off, Xaril is healed for 5% of his maximum Health.

v2.1
-Finishing rework!
-Nerfed Toxic Injection's effects on minions, since it was too strong for lane pressure
-Volatile Reaction reworked to amplify Toxic Injection instead of dealing a sad amount of damage
-Added talents

v2.0
-Rework!
-Toxic Injection has reduced stacks, more damage, no longer reduces healing; Toxic Overload effect removed, but enemies explode on death
-Envenom changed to be a double-strike area of effect with similar effects (and got a new icon)
-Catalyst changed to Slow instead of applying Toxic Injection, and its one-time effect now triggers Toxic Injection's death explosion early
-Replaced Volatile Reaction (Singed-style poison trail) with Serpentine Strike, a dynamic dash ability
-Raining Blood (passive buff with boring active) changed to a flashy 2-part finisher attack
-What Doesn't Kill You... (self-applied poison with buffs) replaced with reworked Volatile Reaction
-Talents still WIP