I think this card is a great addition to the game, thanks for thinking of it and making it.
I see that there has been some debate on the wording as to how the card should work. The wording that is used now works for what you want it to do, but I know how the people I play the game with would want it to work, after all monsters are killed and traps disarmed.
First turn - Dwarf rolls and moves into position (move), then places the powder keg (action), end turn.
Second turn - Dwarf lights the powder keg (action), then rolls and moves out of the way, then keg explodes, end turn (with all the other monsters and furniture in the other room blowing up and any furniture in the room the keg was placed in (within the red squares) blowing up).
Like I already said it works the way it is and I like it, I'm just giving my input on the subject.

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