I'm going to be running a game in a few weeks, and when I DM, I like to to explore unorthodox battle ideas. So first off, forgive the absurd McGyver-ness of this idea.
I'm running a game for a fairly low-level party, and I want them to engage a pair of ogres. The ogres will get a surprise round on them and be attacking from a fair distance using a ballista. This would be easy, except I want to use zombies as the ammunition for it. One ogre uses his round to load a zombie into it, and the other uses his round to fire at the party.
My question is: what amount of damage should I do to the zombies? I'll add 3d8 (which is the ballista damage), but I feel like there ought to be falling damage. I've been testing the idea with Troglodyte Zombies and 3d8 + 5d6 worth of damage to them. With their 5/slashing DR, most survive on an average roll with 5 or so hit points left. Should I up the damage to them and use Zombie Bugbears? Or does that sound reasonable? Or at least as reasonable as a ballista set up to fire zombies can be...O_o