What is how to get ominous trial key?

To obtain an Ominous Trial Key, you must defeat a Trial Chamber's Ominous event. The Ominous event begins when you apply the Ominous status effect to a Trial Spawner.

• Acquiring the Ominous Effect: You can get the ominous effect by drinking an Ominous Potion or shooting yourself with an Ominous Arrow. These are obtained from the Trial Chambers.

• Applying the Ominous Effect: Once you have the effect, approach a Trial Spawner. The Trial Spawner will then turn into an Ominous Trial Spawner and begin a more difficult trial with more mobs and potentially stronger variants.

• Defeating the Ominous Trial: Successfully completing the Ominous Trial will cause the Ominous Trial Spawner to eject loot, including the Ominous Trial Key.