Wraith

The dead still plague the aftermath of the Summoner's Rift and Twisted Treeline, and those who chose to linger here have turned to ghastly Wraiths. These flying Undead attack any who happen to pass by, haunting their victims with visions of the death and destruction that took place here.

Wraith has a low lifesteal, but it's usefulness is focused on early to mid which makes it harder to kill.