RTF is a global modification that replaces all towns in the game.

Isn't he a large creature? If so, you could give him an area-of-effect attack, like a cyclops, but change it (this is possible, I've seen it). Make the attack hit 6 cells (one is the cell where the hammer strikes, the second is the cell behind it, and two on each side)

Added after 35 seconds
Like an attack that hits everyone around the point of impact, you could also give it a stun effect.