During the quest Griffin's Bane, Westley is likely to be carried off by the Griffin and pecked to death, though he can be saved. If Westley and all the other Enlistment Corps men survive the quest, Mercedes will thank the Arisen.
"Time a wound heals, we're wounded again twice over..."
"I tell you, a sellsword's wages never match his work. Still, there's a pleasure to butchering monsters, I won't lie."