The Banshee is a level 23 monster found on Floor 1 of the Slayer tower.
Where can I find "Banshee"?
Banshee's Location - Training Teleports > Slayer Tower > Run to the North-East corner.
Lots of Seeds - Most 50% (Limpwurt, Strawberry, ect.) others 11.1111% (Lantadyme, Watermelon, ect.) and .7812% for rares (Dwarf weed, cactus, ect).
Herbs - 50%
Other items are junk and are not worth picking up such as iron mace's, pike, ect.