To make a spirit weapon you have to have a bow wand or sword at 100% proficiency, then visit Emain and talk to the guard outside the palace with privet story. You’ll get a quest that will eventually lead you to Bangor where, with a special pass, you can mine for spirit fossils in the dungeon and have them refined. You’re next task is to get 30 elemental removers from price but there pretty expensive. (I’m having to save up for them) Once you have them though Tarlatch will create a contract with the spirit and you will have a spirit weapon! Good luck!
The one in pink