Giant Arrow at Town Hall 18: max level 18. It unlocks at Town Hall 9. Max level per Town Hall: TH9 9, TH10 12, TH11 12, TH12 15, TH13 15, TH14 18, TH15 18, TH16 18, TH17 18, TH18 18.
Tap a Town Hall to open this item there. Dashed: not available at that Town Hall yet.