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Entities are the main roadblocks that players must face in order to advance. They all differ in mechanics and difficulty, along with some being encountered more rarely than others. Certain audio cues or visual imagery can warn you before an entity spawns in.

Tulla, Arcanum: Of Steamworks and Magick Obscura Wiki

List of Entities, DOORS Wiki

Nonentity Incognito, AI: The Somnium Files Wiki

CG-55 (The Dismal Darkness), ROOMS: Low Detailed Wiki

I'm fairly certain this wasn't even locked to begin with : r/HarryPotterGame

Paradise Ridge Incident, Syphon Filter Wiki

Room Key, DOORS Wiki

List of Entities, DOORS Wiki

Thoughts? : r/ARK

Head Guard, Shovel Knight Wiki

Yashani, Another Bad Side Quest Wiki