Why not? That's what it does in Guild Wars!Li Shenron said:As long as plain regular zombies are in the MM, every variation added is good IMO.
One worry: I hope that it doesn't become a standard that every single cold-themed monster (or every single cold-damaging attack) also slows the target down.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.