DeusExMachina said:
Yeah, you're going to have to be careful as DM with stuff like lava and chasms with all the involuntary movement going on during combat...
Yeah. Player characters pushing goblins back 10 feet- pretty cool. Goblins pushing player characters back 10 feet- still pretty cool. Players characters pushing goblins 10 feet into lava- totally awesome. Goblins pushing player characters 10 feet into the lava- not so awesome.
The problem with that is that it means that you want rules that let your Level 3 Pushy Goblin (or whoever) push a player character pretty freely on the ground. On flat terrain with no boiling pools of acid, you want to see the power used. It isn't a very powerful power, but its cool, so you want the chance of it succeeding to occur freely.
But once you're fighting between pools of boiling acid, that little not-so-powerful-power is enormously strong. Now, based on your terrain choice, you want that power to threaten and frighten players characters, but to rarely occur.
Here's my solution- make sure things like battlements with hundred foot drops on each side at least as wide as twice the distance that the best enemy pusher can push, plus one. Then any character standing in the center that is threatened with being pushed over the edge has to be pushed twice, and has a chance to react in between pushes. Any character standing near the edge has taken their chances.
That's only a big deal with highly lethal terrain, of course.