Golem at Town Hall 9: max level 4. At Town Hall 18 the cap is level 15. It unlocks at Town Hall 8. Max level per Town Hall: TH8 2, TH9 4, TH10 5, TH11 7, TH12 9, TH13 10, TH14 11, TH15 12, TH16 13, TH17 14, TH18 15.
Tap a Town Hall to open this item there. Dashed: not available at that Town Hall yet.