[Champion Concept] Naias, the Dark's Chains
Changelog: -Passive: Name changed to Rusty Chains.
Regenerates 40-55% of missing health over 5 seconds when out of combat upon loosing 50% max health or being in a combat for more than 6 seconds with a champion. New: Every second attack and all basic abilities put the enemy into chains, up to 5 chains. Every chain slows the enemy by 3%. -Q:If it hits an enemy, it can't move away from Naias nor dash or blink for 2 seconds. New: If it hits an enemy, a radius is showed around Naias. The enemy is slowed by 75% if it moves away from Naias. If the enemy dashes, blinks, teleports or gets out of the radius, it is dealt 10 - 350 physical damage (based on enemy level). Cooldown increased to 14 seconds from 10. Damage decreased to 20/40/60/80/100/120 physical damage. -W: Name changed to Jailbreak.A row of spikes puncture trough the ground dealing 20/40/60/80/100 (+60% AD) physical damage and knocking up enemies hit.New: Knocks back all enemies with at least 1 chain. Every additional chain deals 15/30/45/70/85 additional damage and knocks back the enemy 50 units more.
Role: Fighter Lane: Top
Abilities
Passive [Rusty Chains]: Every second attack and all basic abilities put the enemy into chains, up to 5 chains. Every chain slows the enemy by 3%. Abilities steal a % of target's maximum health.
Q [Torture Chains]: Fires a hook that attaches to a champion dealing 20/40/60/80/100/120 (+40/45/50/55/60% AD) physical damage. The more distance the projectile travels the more damage it deals (up to 60/100/140/180/220/260). If it hits an enemy, a radius is showed around Naias for 5 seconds. The enemy is slowed by 75% if it moves away from Naias. If the enemy dashes, blinks, teleports or gets out of the radius, it is dealt 10 - 350 physical damage (based on enemy level). Cooldown: 14 seconds Steal: 9% of target's max health Cost: 20/45/70/95/120 health Range: 1650
W [Jailbreak]: Knocks back all enemies with at least 1 chain. Every additional chain deals 15/30/45/70/85 additional damage and knocks back the enemy 50 units more. Steal: 5% of all target's current health Cost: 8% maximum health Cooldown: 16 seconds Range: 950
E [Chain Lock]: Fires a chain that deals 8% of target's current health (+50% AD) as true damage. If it hits an enemy champion, this ability can be recast to dash behind the enemy. Upon reactivation, grants a shield that blocks 10/20/30/40/50 (+10/15/20/25/30% AD) damage. Cooldown: 24/23/22/21/20 seconds Cost: 8% max health Steal: 15% of target's max health Range: 1000
R [Whirlwind of Pain]: Fires Chains at nearby enemy champions that attach to them. Enemies with health above 50% are knocked back by 850/900/950 units and enemies below 50% are kept inside the radius and dealt 6% of their max health per second for 4 seconds. This ability doesn't steal health, but heals. Cooldown: 150/135/120 seconds Radius: 675 Heal: 55/65/75% of damage dealt Cost: 12% max health
Recommended Items
Starting:

Early:

Essential:
or
if needed more attack speed
Offensive:
or
if going for a tank build
Defensive:

) and more towards a fighter/tank, a bit similar to rhaast. As long as there is sufficient counterplay, this concept is a pretty good one, and with some number tweaks and additions/alterations I have noted it could become quite a bit better :)