Another arrow slams into the hook horror. It spins off the cliff but manages to hang on.
Sarith fire his hand crossbow
Attack [roll0]
Damage [roll1]
Edit: CRIT! So damage (with a roll of 4 on the d6) is 10. It is very badly hurt now.
Orsik prays for healing for Derendil (healing word...otherwise he'll be stuck out on the ledge)
[roll2]
Then he fires a sacred bolt at the wounded hook horror
Dex Save (DC 13) [roll3]
damage [roll4]
Edit: Its save vs poison will matter to see if it avoid the sacred flame.