From Surr@20
** Void Spawn Health Decay:** Is now a % of their current health rather than maximum, minimum of one. This effectively doubles their health (and roaming range!) but greatly reduces their effective health at all points.
Empowered Void Spawn: Empowered Voidlings now scale off 15% of your maximum Health rather than your resistances.
**Point Runner: **Movement speed maximum reduced to 20% (from 30%). However, Movement Speed now decays over 2 seconds instead of instantly dropping off when you leave the proximity of a tower.
This is alongside giving 60 armor and MR. Some champions, like Garen or malphite, can buy this as their sole MR item, and then use adaptive armor to cover the rest, while itemizing for more HP. With this item alone, new Garen reaches 170MR with just this item and scaling MR glyphs, not counting adaptive armor.
Combo that with InvertedComposer's Zz'rot placements, wherein there are now even MORE options to place Zz'rots to take out towers.
http://www.leagueoflegendsmath.com/Zzrot_Portal_Ideal_Placements.html
That is, when you can't just set up camp in front of a tower, place a zz'rots behind you, and let them bash into the tower. They focus on killing the voidlings? Then they aren't focusing on your team. Focus on your team? They they aren't focusing the voidlings. They do about 500 damage with 3.5k HP.