Utterly Mad

This canyon has another dangerous thing about it, and I'm not talking about goblins and megabeasts. I'm talking about the yearly explosion. No, this is not some metaphorical explosion. It's a literal detonation 1 z-level above the ground that extends itself downwards through open space until it makes contact with a solid floor. Like a cave in basically. This explosion regularly occurs around the end of winter at the same time the last of the maps ice melts. The first time this explosion occured, it was actually a cave in. I somehow managed to make a tree float. I dug out all the ground around it and realized I couldn't chop the tree down. Instead of just constructing a platform to cut it down, I dug away the single tile of dirt under it and... It didn't fall. It was floating, which perplexed me for about a minute until I realized the tree wasn't collapsing because it was still attached to something stable: the branches of other trees. I ordered the other trees it was connected to cut down and sure enough, the gravity defying cord of wood plummeted to the earth, leaving behind nothing but a wrecked stockpile. Every year since then, the explosion occurs as the brook thaws. Last time, it destroyed several masterwork bone crafts. The time before that, it took the life of three children and a cat.

Oh, also, werewolves. Not weregophers, not wereantilope, not werewalrus. Just plain old werewolves. That makes this world fairly unique in my opinion.