A rather specific couple of Grease-related questions ...

[Wrunner]

I'm designing a room with trap doors that are there so my players will be at risk of falling into a cave below (where a hungry black pudding is waiting).

To add to the complexity, I want to have a long wide slope they'd slide down between the trap doors and the cavern(so PCs up above can't just throw down a rope for anyone that falls in).

If this slope they'd slide down has Grease cast on its surface, would you allow any PC sliding down it a Reflex save of any kind? The rules for Grease are written for a flat surface. Would they just be forced to slide down if the surface was sloped?

Additionally, my PCs have really taken to Spider Climb, and I can see them, in the event they'd like to climb back up the Greased slope, resorting to Spider Climb to do so. Would you allow this? Would Spider Climb grant them traction on a greased incline?

Thanks!

[Nothing]

If the slope is at least 60 degrees it counts as a wall (any less is a slop that starts as DC 0 to climb). Such a wall would likely have a base DC of 25 to climb, +5 for being slippery with grease (although you could make it a higher or lower DC by making it exceptionally smooth or giving it cracks big enough to serve as handholds).

Trap doors generally have a reflex save to avoid falling in them when they spring, although you get to decide the DC and could design it differently if you wanted to (my favorite is giving them a reflex save, but then also triggering a second trap that makes an attack roll to push them in anyway).

After getting knocked onto the greased sloped wall they can make a climb check at the climb DC + 10 (DC 40 more or less) to catch themselves, otherwise they take fall damage and can start combat with the pudding.

Then climbing out is fun! They have to make climb checks to get up the greased wall at DC 30ish (which they wouldn't have to make with spider climb), and on top of that they have to make a reflex save every round against the Grease spell's DC or fall (taking damage as usual).