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Title: Diablo IV - Onyx Watchtower Stronghold
Description:
The Onyx Watchtower is located in the Dry Steppes zone. Strongholds need to be captured (meaning: Kill all enemies). The fight usually ends with a battle against a boss (in the Onyx Watchtower the boss fight is against Captain Ezmin). And there usually is a Lilith statue as well. After conquering a stronghold some NPCs and merchants settle in and usually there's also a dungeon you can enter afterwards.

Link: https://www.digioso.com/d4_onyx_watchtower