I am trying to figure how to build and determine the CR for a trap. The trap is a "deadfall" where a tree falls across the party as they are traveling. First the tree would make an attack roll on one or more members of the party, depending upon how they are marching, then I would like to add a Relflex save to not be trapped under the tree.
The first part is very straight forward, it's the second half I am having trouble with. It appears that the traps don't, with the exception of pit traps, actually trap people.
Deadfall trap part 1:
Type mechanical; Perception DC 20; Disable Device DC 20
Effects
Trigger touch; Reset none
Effect Atk +15 melee (3d6); multiple targets (all targets in a 20-ft. line)
So if I am correct, the CR of part 1 is 3?
Deadfall trap part 2:
Type mechanical; Perception NA; Disable Device NA
Effects
Trigger being attacked by part 1; Reset none
Effect Stuck under a fallen tree (DC 20 strength check to remove the tree); Reflex DC 20 to avoid being trapped.; multiple targets (all targets in a 20-ft. line)
And the CR of part 2 is 1? Is there any way to raise the DC of part 2?
It sounds comparable to being caught in an entangle spell, in which case you could look up the entangled condition, saving throws and penalties.
I think you are looking for the Pinned condition. Assign an appropriate CMB
Thank you Brambleman, I hadn't thought of that.