Niewyczerpane bogactwa

those are the mini-events in the FFA zone of CutlessKeys, they have a golden beam and you have to fight a few waves of ghosts until you can open the spectral chest.

with patch 2.0.0 [Jan 21, 2025] [2:00 PM] Season of Conquerors the patchnotes states:

"Spectral Chests in Cutlass Keys now give 45-55 doubloons, up from 14 doubloons. They are also now a source of Goldcursed Coconuts."

Found a chest with this name in FFA that showed up on map and had a yellow beam going into the sky.

The chest had chains round it and opening started 3 waves of mobs before it could be looted. Seems to be a normal cursed hoard amount of doubloons (had coconut, so don't know if that would drop).