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Nearby Elder Guardians will now be briefly highlighted after one dies. This can be disabled with the highlightOtherElderGuardians config option.
Previously, in multiplayer, players sharing the same age progression would be required to kill three Elder Guardians each. Their kills would not be combined, forcing players and teams to complete multiple Ocean Monuments.
Instead, now, any players present in the Ocean Monument when killing the last Elder Guardian will be rewarded. The search radius for this function can be configured with the oceanMonumentSearchRadius config option.

Overhauls Minecraft's progression system to be more nuanced and refined. Adding more friction before reaching The End.