19

I need your help fellow travellers, I'm making a list of 19 elements from the Dark Tower for a drawing concept and I am stuck. Can you help me complete and/or improve my list?

So far I have:

1. The Dark Tower
2. The Rose
3. The Turtle Maturin
4. The Unfound Door
5. The whittled key
6. Roland's revolvers
7. The Crimson King's Eye
8. Ka / Ka-tet
9. The beam / path of the beam
10. The horn of Eld
11. The gunslinger's creed
12. The Tet corporation
13. Black Thirteen
14. The pink grapefruit
15. North Central Positronics
16. the jawbone?
17. Rook skull
18. ...
19. 19