How it works
 

• Everyone starts out normal with all the Hearts on the life bar.
• You have to use the command /function one_heart one_heart to leave the life bar with only one heart

/function one_heart

• To get the health bar back to normal with the 10 hearts, you must use the command /function all_life

/function full_life

• to see the commands just type /function which will already appear the two possible modes.

UPDATE

You can use the /function command all_full_heart and all_one_heart to change the lives of all players at the same time

Two new function have been added

/function low_gravity

• Using effect leaves gravity low. Use the /function low_gravity_stop to disable

/function strong_mob

• Makes all mobs in the game (not the player) stronger. Use the /function strong_mob_stop to disable

/function half_heart || /function all_half_heart

• Make one or all of the players have only half a heart