Banshee
Banshee can be found in the following locations: Single one under the White Flower Temple in Thais (respawn takes about 20-25 minutes), Banshee Quest area in Ghostlands (also accesible by Isle of the Kings), Demon Quest Room, Drefia, Ancient Ruins Tomb, Desert Dungeon (unreachable), Pits of Inferno in Tafariel's Throne room, Cemetery Quarter in Yalahar, Vengoth Castle, one in Robson Isle.
Banshee has 1000 hitpoints. It is immune to earth, fire, life drain, drowning, and death damage. It is weak against holy damage. It can neither be summoned nor convinced.
Banshee yields 900 base experience points. Its loot can include candlestick, wedding ring, crystal ring, silver brooch, white pearl, black pearl, gold coin, silver amulet, spellbook, life crystal, stone skin amulet, ring of healing, lyre, poison dagger, red robe, blue robe, simple dress, strong mana potion, terra mantle, petrified scream, hair of a banshee, and sweet smelling bait.