Spawnstones
This mod will soon be merged into a larger modification called HEXSTONES.
Add temporary respawn points to your game world with the Spawnstones mod! In flat biomes of the overworld, you'll find special altars containing indestructible spawnstones. These unique objects allow you to set respawn checkpoints anywhere you want.
You can activate a spawnstone simply by right-clicking on it - this will link your character to that location. After activation, you will respawn at that stone after death instead of your usual bed. To cancel the binding, just right-click the same spawnstone again - your character will once again respawn at the bed (or world spawn point if the bed was destroyed).