Key Features:

Blocks all hostile mob spawns above Y=128 in the Nether dimension

Preserves friendly mobs (passive, tameable, villagers, golems)

Zero performance impact - uses efficient entity load event handling

Perfect For:

SMP servers wanting to prevent Nether roof farms

Players who want to build on the Nether roof without mob interference

Modpacks needing controlled Nether spawns

Installation:

Drop the jar file into your mods folder

No configuration needed - works out of the box

The mod maintains perfect vanilla behavior while solving the specific problem of unwanted Nether roof mobs. Its surgical approach only affects the exact mobs you want to control, leaving all other game mechanics untouched.