This mod makes the ender dragon drop a dragon head. Nothing else. No config, no settings, just ender dragon dropping its head.
When the dragon is killed a dragon head item is spawned, making it easier to show off that you've killed the dragon.
Enderdragon Skull is also available on Modinth: https://modrinth.com/mod/enderdragonskull
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If you'd like your ender dragon to also drop elytra, consider downloading Enderdragon Elytra: https://legacy.curseforge.com/minecraft/mc-mods/enderdragon-elytra