Minecraft Dungeons:Elder Guardian

Elder Guardians are Mini-boss mobs and a stronger variant of the Guardian that will appear in the upcoming Hidden Depths DLC for Minecraft Dungeons. While their behavior is currently unknown, they will probably be hostile. It most likely will spawn as a boss at the end of the Coral Rise (unconfirmed name) mission, as seen in the dev diaries episode on the DLC.

Behavior
The Elder Guardian's main attack is its ability to aim and launch beams at the player. Other than this, not much is known.