You have to complete the arena minigames.
Chat with our AI personalities
No like in Crash of the titans we play as both crashes on co op adventure
you play as a alien on terran-mind control at new york and destroy the giant crystal thing in the pit then complete the mission then return to new york on the level called rise of krystalak and defeat him to unlock him in store.
A mind tiara is a mind talisman that you wear. If you do not know what a mind talisman is, Well than a mind tiara is used for making mind runes, it helps you find the mind runecrafting place and you need a mind tiara/talisman to craft mind runes!
The same way you crafted Air Runes, the mind altar is located west of Ice Mountain near the edge of the Wilderness, and is east of the Goblin Village. You may unlock the music Miracle Dance here. The closest bank is in Edgeville, but that path crosses the Wilderness which should not become a problem if you travel along the Wilderness ditch. The second closest bank is in Falador.
To make a mind tiara, take a normal tiara and a mind talisman to the mind altar.