Michael casts Enlarge upon himself and catches up his hammer in both hands.
"There's no more healing I can do--some of Sela's gifts cannot be altered, even to preserve life."
He eyes a segment of the wall critically.
"And I'm really a fifth wheel there anyway. Almayce can do all the magic I can and more. You'd better stand back a bit."
The hammer whistles off his shoulder and slams into the rock like a bomb.
(Large hammer, two hands, full power attack: do we need to make any rolls, or is there just crunchy rock?)