There are a variety of different Zom-Boosts, each affecting Zombies in different ways and giving a variety of small buffs that add up over time.
Zom-Boosts are a new feature introduced in Endless Apocalypse.
There are two new features in this game mode, Zom-Boosts and Buffz & Bruisez as well as Perks, which return from Penny's Pursuit in PvZ2. It replaces Endless Zones and features infinite randomly-generated levels which slowly increase in difficulty as the player progresses.
Endless Apocalypse is a new game mode in Plants vs.