Pets can initially only be purchased during the presale, but once the game launches they can be found for sale by players. Upon purchase players are rewarded with an equipable Pet. Which pet you get on each purchased Token is randomized, with the most powerful pets being very rare.
Pets have a few characteristics:
Passive generation of crafting resources
Increase dungeon item drop chance
Increase dungeon completion rewards
Removes the Fatigue rate increase a Hero would suffer from when going into a Dungeon.
Allows players to use their favorite Heroes for longer without suffering penalties to Hero Stats