Rage Spell at Town Hall 8: max level 5. At Town Hall 18 the cap is level 7. It unlocks at Town Hall 7. Max level per Town Hall: TH7 4, TH8 5, TH9 5, TH10 5, TH11 5, TH12 6, TH13 6, TH14 6, TH15 6, TH16 6, TH17 6, TH18 7.
Tap a Town Hall to open this item there. Dashed: not available at that Town Hall yet.