netherite monstrosity

The netherite monstrosity will live in the nether.IT will be a boss.Its attacks will be lava,punch,stomp and it will spawn netherite golems.plus i want to add a portal guard they will be piglins but a bit bigger and stronger.To spawn it you need nether cryistals to fill in the netherite frames but these havent been added yet so i want it to be part of the 1.21 update.The netherite golems can be spawned by placing 4 netherite blocks in a T shape