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Endless Gravity

Endless Gravity adds low gravity to The End and a pressure-curve atmosphere to the Overworld, with Sable sub-level support.

Overworld Atmosphere - A continuous pressure curve (8 configurable altitude → pressure layers): gravity weakens as you ascend and audio muffles, up to full vacuum at Y 3500
End & Sable Gravity - Configurable upward force for players, items, arrows, projectiles, and falling blocks in The End
Fall Damage - Two modes: vanilla or disabled (The End and Sable dimensions; the Overworld keeps vanilla damage, cancelled above a configurable altitude)
Muffled Audio - Low-pass audio filter in The End, smoothly interpolated from the pressure curve in the Overworld
Sable Compat - Generates dimension_physics datapacks for The End and the Overworld from the same pressure curve
Modded Config Screen - Cloth Config bundled; All, The End, Overworld, and General tabs
Addon API - EndlessGravityAPI utilities (pressure, progress, Sable helpers, sub-level projection) plus the gravity_immune entity tag

Install the mod on a NeoForge 1.21.1 server and client (Cloth Config is bundled - no manual install).
Join any world - The End has low gravity by default.
For Overworld space, fly up past Y=64 - the atmosphere is enabled by default and ramps to vacuum by Y=3500.
Optionally install Sable for full physics-engine integration (the mod runs fine without it, only sub-level physics and the datapacks are skipped).