Wormholes are timed areas where you can limit test your character. When you kill all the monsters and go towards the pentagram a boss will spawn. After beating the boss, gain all the items from monsters killed as a loot explosion. You can decide to upgrade your wormhole to make it harder, the faster you cleared the more levels you gain. Wormhole also has global rankings and at certain thresholds you will be eligible for seasonal rewards which range between different types of cosmetics!