the niche protection rant, I thought I might ramble a bit about a monster topic. For the past week or so, on one forum, there's a thread on popular monsters you think are stupid. I misread the intent as "monsters you think are stupid, but love anyways." Which fits perfectly with another thread that's been running for a week or so on another forum. There, the topic is the gelatinous cube, which qualifies as a possibly stupid monster that I still love.
I went back to Greyhawk and looked at the Cube. Oddly, it's not immune to missile weapons like I thought. I figured slings and arrows would just pass straight through. I think I will run them that way, anyways. Also, though, I thought the Cube was practically transparent, as it may indeed be in AD&D. But Greyhawk says it's only semitransparent. I read that as light -- and shadow -- pass through, but not visual details.
I'm imagining the Cube encounter underground as looking more like a damp stone wall than a block of Jell-o. An apparent dead end. Realizing that it's not a wall is about the same as detecting a secret door: very difficult. When it moves, though, the party would realize it's not a (normal) wall. The same applies if there's a light source on the other side, since the wall will appear to glow. The party can outrun the Cube, because it is slow, but they may run into it (literally) later, at a really bad time, like during an escape.
I really think the Gelatinous Cube is a good opportunity to play up the weird, almost Lovecraftian aspects of dungeon crawls. Which is probably why I love 'em.