Anarchy league

"The corruption of Wraeclast has spread to the minds of many Exiles, turning them against one another. As you journey through the world, you will occasionally run into these exiles - Deadly computer controlled enemies who use the skills and items available to player characters. If you manage to kill one, they drop a lot of items including a magic or above for each equippable slot."

- Description on the official Path of Exile website

The Anarchy challenge league was a four month softcore league. This league introduced rogue exiles.

It was announced on May 31, 2013, along with the Onslaught league and started on June 7, 2013. It lasted until October 7, 2013. At the end of the league all characters and stashes were moved to Standard league. Characters that died during the four months respawned in Anarchy.

Modifier
All areas had

Items
Anarchy had six exclusive base item types (all shared with Onslaught) and four exclusive uniques (two of which were shared with Onslaught). Two base types, and, and the unique  were disabled in both Anarchy and Onslaught. All new base types were implemented to the regular leagues after Anarchy ended. The exclusive unique items did not, but may return in the future.

Exclusive base item types
The following item types were introduced exclusive to Anarchy and Onslaught. Following the end of the leagues, these base types became available in standard and hardcore leagues.

Exclusive uniques
The following uniques were shared between Onslaught and Anarchy.

These two uniques were specific to Anarchy.