Eternatus
Eternatus is summoned from the Eternatus Cocoon in the End. The bundled structure file places cocoons in End Highlands and End Midlands, while the encounter evidence shows a 500 Galar Particle deposit requirement.
How to Obtain
Carry all 500 loose Galar Particles in your inventory before interacting with the cocoon. The guide screenshot shows the required total.

The bundled recipe uses one Poison Gem, three Galar Particle Blocks, two Eyes of Ender, and one Poke Radar.

The radar materials are additional to the 500 loose particles deposited at the cocoon.
Search End Highlands and End Midlands for the large cocoon structure.
Interact with the cocoon once while carrying the 500 particles. Confirm the deposit feedback, then interact a second time to summon Eternatus.
Mega Showdown provides the Star Core route shown below. Its recipe requires a Wishing Star, which can be obtained in the Wishing Weald.
## Troubleshooting
Sources (4)
- Bundled data — data-parser/data/mods/LegendaryMonuments-Cobbleverse.jar — cocoon structure and End Highlands/End Midlands biomes
- Bundled data — data-parser/data/datapacks/COBBLEVERSE-DP-v31.zip — Eternatus spawn range and radar recipe
- Bundled data — data-parser/data/mods/mega_showdown-fabric-1.8.4+1.7.3+1.21.1.jar — Wishing Star and Mega Showdown progression assets
- Bundled data — site-content/legendaries/eternatus/images — in-game particle total, cocoon sequence, encounter, and Star Core evidence