I tried to give the surfaceparms lava and slime to solid objects, and it doesn't seem to work. It just makes the objects nonsolid and does not give them a damaging effect. So why would I do this instead of just having a trigger_hurt? I set up a func_pendulum and wanted to have a swinging axe made out of molten rock that must be avoided, and AFAIK a trigger_hurt can't move. It looks cool like it should but it just passes through a player rather than stabbing and killing a player like it is supposed to. (The damage key on func_pendulum also appears to be broken. FS really needs to fix all of these entities!)
LCDLC Mapmaking Dept.
Maps finished: Hellhouse, Sorry, Worrior 1-20
Maps modded: CubeOrigin
Maps in release candidate: Blockforts, Cannons 1, Hotzone, Icecastle
Maps in beta: Arctica, Cannons 2, Cerulean-River, Igloo, Skygarden, Spacestation
Maps in alpha: Merlin, Totem