Dame Simonetta and Bilfur combine their strength to shift the boulder a few inches. (2x1d6=3,5 success.) Having now felt the boulder's weight, Dame Simonetta is convinced that whoever put it here was not an "average" human; they would have to be a peak physical specimen (18+ Str, and even a Hobbet with 18 Str couldn't move the boulder due to their small size, at least not without magical assistance from a potion of giant strength or similar).
Robur borrows a lantern from one of the henchmen and wriggles through. This is what he sees:
On the other side of the boulder is a natural, unworked cavern. There are six enormous mushrooms, each twice as tall as Robur. They have bright red caps, so let's call them
cherry-headed dalek mushrooms!
The thin cord that I mentioned earlier is attached to fish hooks, and the fish hooks are sunk into the mushrooms' flesh, so that pulling the string tugs at the mushrooms. When Robur crawls into the room with his lantern, the screaming intensifies! Robur can see that the mushrooms are capable of snail-pace movement by 'scootching' across the floor. They are trying their best to get away from him, screaming as loud as they can out of the many 'mouths' dotting their caps.
[f=59]
Stern (
Strong Hero, MV 9′′, AC 3, HD 4, hp 20, FC 4 men/hero, SV F4, L)[/f]