Black Catalyst Question

This item is a ring that gives negative stats and is a set item. It says 1/1 set item and I have no idea what its for. The description says it makes you want to equip both so I bought two of it and still nothing. Someone figure out what this is. It might have some benefits if equipped with nii armor or something.

Also this is an item from corrupted zombie dungeon

 

I don't actually know about this item, but equipping two of the same set ring does give a set boost that isn't shown, like how the Jester set works. Maybe it has some hidden stats you'll have to figure out?

 

wait like a set boost that does not show up in your stats? That's so weird...

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Update: It gives
10% spell dmg
2/4 mana reg
35/4 Lifesteal
20% xp bonus
+50 spell dmg
+150 hp

These bonuses only apply when you equip TWO rings. The bonuses only show negatives when you hover over the rings when equipped but they really give the boosts shown above.

 

Where do you get this item :/

 

Corrupted underworld crypt iirc