The White Flower Temple is located south of Thais. The NPCs Norf and Edowir can be found here. Norf provides one of the five blessings. The surface of the temple is a Protection Zone, restricting you from engaging in combat. Very dangerous undead can be found under this temple.
If you go down, you will find a Gate of Expertise for level 25 and up. After the door, there are 2 Ghouls. Down the stairs you will encounter a Banshee. Not good for a fast hunt because the Banshee takes a while to respawn (25 minutes).