Black Catalyst Set

The Black Catalyst Set is an accessory set obtainable from the Dungeon Merchant of the Corrupted Underworld Crypt. Unlike other item sets in the game, this set is only comprised of one item: the level 83 ring "Black Catalyst". While just wearing one ring only provides negative bonuses, wearing two Black Catalysts in both ring accessory slots gives an "invisible" set bonus that's beneficial. The positive set bonuses of wearing two Black Catalysts aren't displayed by scrolling over the set items, but they still appear in the Character Info compass.

Statistics
The Black Catalyst set is composed of the following pieces:

Set Bonuses
When a pair of Black Catalysts are used at the same time, the following set bonuses are applied:

Lore
"Even simply looking at these odd rings gives way to a compulsion to wear two of them, despite all better judgement."

Trivia

 * The Black Catalyst set is the only set in the game to consist of only one item.
 * The Jester Set is another item set that can provide a "hidden" set bonus, if an extra ring is worn with the full set.