Oh and Jack, I don't recall if I ever shared the updated statblock for Macbannin to make him a bit more of a challenge. Are you doing 4e or PF? The short version is that I let him use a version of 'bonds of forced faith' so all the damage to him is dealt to the house staff first.
The "missed attack" rules are a little weird - what happens when he takes 12 damage from a missed attack? That's not so far fetched for some dailies. 'Course most DM's won't be thrown by that, I'm sure ;-).Here's the encounter in the partially laid-out hardcover.
He gives you one of the curses. Is that not clear?
It's supposed to be that he can either apply a curse as a standard action by attacking you, or do it reactively once the bond no longer has people left to eat damage for him.