O.o You know, that's no problem for a cleric with decent Turn Undead abilities. Here's a screenshot from D&D Online of my turning cleric, Clairica Turner, destroying 13 zombies and skeletons with a single use of Turn Undead at level 1... I'm pretty sure that I could easily take out 24 zombies surrounding me now
*Searing Light*
*Undeath to Death*