Delirium League

The new Delirium content gives each area an item called the Mirror of Delirium. Players will see a ghostly reflection of their character in the Mirror and touching it causes the player character to enter a special Delirium state. In this state, the area becomes covered in mist and any existing monsters gain new abilities, while other new monsters will also spawn, acting as a manifestation of the player character’s fears. The further players move into the mist, the more monsters will appear and the more extra abilities they have, making it more challenging.

Rewards

You can find Orbs of Delirium which can be applied to maps to uniformly apply Delirium to that map. Each additional Orb increases the density, dramatically increasing its difficulty and how rewarding it is. Each Orb of Delirium has a reward theme, and sets the Delirium reward type for that map.

However, the rewards go deeper than that. Any maps affected by these orbs will drop Simulacrum Splinters. 100 of these splinters combine to create the Simulacrum, an item that enabled access to a special new end-game challenge.

Passives

One of the most exciting new item types being added in the Delirium league are cluster jewels. These items can be placed onto the passive skill tree to add even more passive skill slots, allowing even further player build customization. There are small, medium, and large cluster jewels, all which have a different number of passive slots. Some cluster jewels will even contain build-defining abilities

All characters and stashes will be moved to Standard league and Hardcore league respectively when the leagues end. Characters that die in the Hardcore Delirium league are immediately moved to the permanent Standard league.