I just read the entry on the Apparatus of Kwalish in the DMG. There is nothing that says what happens to the vehicle when it runs out of hit points.
Does it regain hit points? If so, how? Or is it destroyed? What happens to it when it is destroyed?
@Axoren 1 week later: My players have set up a flying bombardment platform to kill tarrasques. They've gained eight levels in the past session and there are still three more tarrasques.
Imagine that on each edge of your square stands an enemy, but the diagonals are not occupied (□: unoccupied square, E: enemy, P: player):
□ E □
E P E
□ E □
Do you need to Tumble Through? Based on its text, tumbling is only necessary if you want to be (temporarily) in a square:
[...] During this...
I had a cool idea for a warlock patron (doesn't need to be D&D 5e, but it's the angle I'm starting at). The character's got something the patron wants, and the patron is sweetening up the character