Voidlings and Ghouls
So...
http://leagueoflegends.wikia.com/wiki/Malzahar http://leagueoflegends.wikia.com/wiki/Yorick
Voidlings have their duration shortened
Mist Walkers don't seem to have timers
Voidlings don't get to leap at people affected by Malefic Visions or Nether Grasp
Mist Walkers leap at people afflicted with Morning Mist
Voidlings lost the ability to tank towers
Mist Walkers can tank towers
Riot wtf.