Jug of the Elemental
From AmtWiki
A relic from Nautical Nights.
Description
Fill a plastic gallon jug with water and blue food coloring. Whomever possesses the Jug gains the services of a Companion (Water Elemental). This Elemental has Serial Immortality so long as the Jug contains at least one inch of water, and changes teams should the Jug come into another’s possession. The Elemental always comes alive within 10 feet of the Jug. Should the Jug be emptied below the one inch mark, the Elemental is destroyed and removed from the game. The Jug itself is immune to all magical effects. (More of a game than a relic...)