Tier Boost

Tier Boost is an extremely rare pet item that was added in the 0.7.8 Pets V2 Update and is used by right-clicking on a pet. It increases the pet's Rarity by tier. It can be crafted using the Tier Boost Core which can be dropped by the Endstone Protector.

For example, the Tier Boost will change the rarity of an pet into a  pet.

WARNING: The Tier Boost is a Pet Item, meaning it can be used only on pets that have an empty Pet Item slot and cannot be used in combination with any additional Pet Items. Using another Pet Item on a pet already equipped with this item will destroy the Tier Boost and overwrite it with the new item.

Using a Tier Boost on a  pet will not level up the pets' rarity to unlike the Recombobulator 3000 when it is used on a  item.

It is advised to use the Tier Boost only on hard to get / expensive pets like the Phoenix Pet and the Ender Dragon Pet.