Is he melee? If he's ranged, he's gonna be ridiculously OP AD carry. You realize that
Sanguine Blade is only 1% lifesteal with each attack, and only goes 7 times? That's to prevent the stupid amount of lifesteal you would get with something like your passive. Sion's ult gives a ton of lifesteal, yes, but it is his ultimate.
Perynx corrupts a target with thorns that deal 60/100/140/180/220 ( +.25 AP) magic damage over 5 seconds. If the target is then struck by Corrupt Chain they will take physical damage equivalent to Vile Thorns instantly instead.
How does it make sense for Corrupt Chain to deal less damage if it's strung together with Vile Thorns? Corrupt Chain has a higher base damage at rank 5 than Vile Thorns at rank 5.
Inner Chaos should have a stronger shield. Not only would it be difficult to not attack for 4 seconds (CS'ing, if you are teamfighting that's 4 seconds of free damage), when you finally do get the shield, it's pitifully small.
That's all I can find for now.

Perynx corrupts a target with thorns that deal 60/100/140/180/220 ( +.25 AP) magic damage over 5 seconds. If the target is then struck by Corrupt Chain they will take physical damage equivalent to Vile Thorns instantly instead.
How does it make sense for Corrupt Chain to deal less damage if it's strung together with Vile Thorns? Corrupt Chain has a higher base damage at rank 5 than Vile Thorns at rank 5.
Inner Chaos should have a stronger shield. Not only would it be difficult to not attack for 4 seconds (CS'ing, if you are teamfighting that's 4 seconds of free damage), when you finally do get the shield, it's pitifully small.
That's all I can find for now.

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Perynx
Corruption's Warrior
Lore
I have no recollection of my memory. Of my past life or lives. I know only of the beast inside me that thirsts for blood and corruption. I fight a constant battle, back-and-forth, day after day. My only wish is to fight this urge, this need to kill. To control myself, and most of all, to find my past self and return. - Perynx
Skill Set
Passive: Bloodlust
Perynx gains 5% lifesteal with each basic attack. This effect lasts for 4 seconds and can stack up to 10 times. (50% lifesteal)
Q: Corrupt Chain
Perynx lashes his chain in a straight line dealing 50/90/140/200/260 ( +.25 AP) magic damage to all targets hit.
Cool Down: 7 seconds / 6.5 seconds / 6 seconds / 5.5 seconds / 5 seconds
Cost: 50 mana / 55 mana / 60 mana / 65 mana / 70 mana
W - Vile Thorns
Perynx corrupts a target with thorns that deal 60/100/140/180/220 ( +.25 AP) magic damage over 5 seconds. If the target is then struck by Corrupt Chain they will take physical damage equivalent to Vile Thorns instantly instead.
Cool Down: 13 seconds / 12 seconds / 11 seconds / 10 seconds / 9 seconds
Cost: 70 mana / 75 mana / 80 mana / 85 mana / 90 mana
E - Inner Chaos
Perynx focuses his energy for 4 seconds. If Perynx hits an enemy with Corrupt Chain during this time the target will be stunned for 1 second. If Perynx does not attack during this duration he gains a shield of 50/90/130/180/200 ( +.1 AP).
Cool Down: 20 seconds / 18 seconds / 15 seconds / 12 seconds / 9 seconds
Cost: 80 mana / 90 mana / 100 mana / 110 mana / 120 mana
Ultimate - Sinister Lashes
Perynx's next 5 auto attacks slow targets by 30% / 50% / 70% and deal an additional 80/100/120 ( +.3 bonus AD) physical damage.
Cool Down: 120 seconds / 100 seconds / 80 seconds
Cost: 100 mana / 150 mana / 200 mana
So, comments and criticism, questions?
Personally I'm not sure if that passive is OP or not... And he seems to be heavily auto attacked base. I figured a typical build for him would look like: