Void Spirit Domain

"System Notification: You are being corroded by a dark elemental curse. All base stats are reduced by 10%."

"System Notification: You are under the protection of Purity Orb. All negative statuses have been cleansed."

It's a formation?

And a dark-type formation that reduces base stats?

Based on Kaelen's judgment, this Umbral Temple seemed to be enclosed within some kind of formation.

Just stepping