Use the Summoning Staff or the mod’s spawn item if your version includes one
Place the required summoning structure or altar from the mod
Insert the correct materials required by the mod
Activate the structure to respawn or summon the Netherite Monstrosity
If the boss was already defeated, use the mod’s respawn method for that boss fight
Make sure the boss arena is clear and the required dimension or biome conditions are met
Check the mod documentation or config for the exact respawn recipe or command for your version