23
Deciding to search the room before moving on you look through the bones. You are half-way across the room when you hear the twang of a bow string and, you realise you have stepped upon a trigger stone. Acting quickly you dive out of the way.
Make a L2SR on DEX and, if you miss it take the difference in damage. Cutting your losses you leave the room through a door in the north wall, go to 8.