Lifesteal fiesta - Open Wounds

Open Wounds (Nai'x)
Skill Description: Naix rends the enemy, slowing his movespeed and allowing his allies to feast on his life force, regenerating a portion (10%/15%/20%/25%) of the damage dealt. Victim slowly recovers movement speed over 7 seconds. Mana Cost: 70/80/90/100. Cooldown: 30/25/20/15 .

Explanation: Now some important points on this skill:
1. The percentage given in the tooltips is the lifesteal percentage, not the slow.
2. Open Wounds will stun the enemy for 1 sec, 70% slow for 1 sec, 60% slow for 1 sec, 50% slow for 1 sec, 30% slow for 1 sec, and 10% slow for 3 seconds. (8 seconds in total)
3. This skill stuns the target for 1 second at all levels.
4. Linken's Sphere will block the 1 sec stun but not the slow. However, there is another 0.1 second stun so Open Wounds will still cancel channeling even if you have Linken's Sphere.
5. Casting nukes or other damaging spells on the target will also regenerate your HP.
6. The slow is removed by Purge. However, the subsequent reapplications of "slow" that create the gradual recovery of speed will not stop.

So, you can see why its a lifesteal fiesta for a team.