Galahad Ruins B1; Right after you use silver flame to clear the purple mist on the entrance.
Galahad Ruins B1; Go to east wing (dead end path), you will find it on big square room.
Galahad Ruins B1; After finding the bow, go north. You should see the monolith.
Galahad Ruins B2; Right After Mikleo re-join your party, go east to square room to find it.