Little known to the occupants of the dry world, Dark Reef is a cadaverous prison where the nastiest of the sea-bred are sent for crimes against their colleagues. It is a razor-barbed lair full of murderous slithereen, deceitful Deep Ones, sociopathic meranths. In this badly lit labyrinth, patrolled by eels and protected by giant anemones, only the vicious survive. Hurled into Dark Reef for offenses unknown, Slark spent half a lifetime without family or kindness, trusting no one, surviving through a mixture of stealth and ruthlessness, keeping his thoughts and his plans to himself. When the legendary Dark Reef Dozen connived their ill-fated breakout, they kept their plans a great secret, assassinating anyone who could have put the pieces together–but somehow Slark recognized their scheme and made a place for him in it. Ten of the twelve died in the escape attempt, and two were captured, hauled back to Dark Reef, and then executed for the entertainment of their fellow inmates. However, Slark, the unsung thirteenth, used the tumult as cover and slipped away, never to be caught. Now a secretive resident of the carnivorous mangrove scrub that holds the southern reach of Shadeshore, Slark remains the only successful fugitive from Dark Reef.
ABILITIES

Dark Pact
After a short delay, Slark sacrifices some of his lifeblood, purging negative debuffs and dealing damage to enemy units around him and to himself. Slark only takes 50% of the damage. Slithereen are capable of quickly regrowing appendages, in case of critical injury, to save their own lives.
Mana Cost: 55/50/45/40
Cooldown: 9/8/7/6
Ability: No Target
Damage: Magical
Delay: 1.5
Radius: 325
Damage: 75 / 150 / 225 / 300
Pounce
Slark leaps forward, grabbing the first hero he connects with. That unit takes damage and is leashed to Slark, and can only move a limited distance away from Slark’s landing position. Time in the Dark Reef made Slark a dangerous assassin; aggressive and fearless.
Mana Cost: 75/75/75/75
Cooldown: 20/16/12/8
Ability: No Target
Damage: Magical
Distance: 700
Pounce Damage: 70 / 140 / 210 / 280
Leash Duration: 3.5
Leash Radius: 325
Essence Shift
Slark steals the life essence of enemy heroes with his attacks, draining each of their attributes and converting them to bonus Agility. With each strike at his adversaries, Slark’s knowledge of their weaknesses improves.
Cooldown: 0.40/0.35/0.30/0.25
Ability: Passive
Agility Gained: 3
All Attribute Loss: 1
Duration: 15 / 30 / 60 / 120
Shadow Dance
When used, Slark hides himself in a cloud of shadows, becoming invisible (attacking, casting spells, and using items do not reveal Slark). Passively, when not visible to the enemy team, Slark gains bonus movement speed and health regeneration. The hidden Thirteenth is a slippery foe.
Mana Cost: 120/120/120
Cooldown: 25
Ability: No Target
Duration: 5.5 / 5.5 / 5.5
Bonus Movement Speed: 30% / 35% / 40%
Health Gained Per Second: 3% / 5% / 7%