Forge Mods for Minecraft 1.21
Browse 12 free Forge mods for Minecraft 1.21 — popular picks include Advanced Wall Climber API, Dynamic light, Zombie Horsemen.
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Advanced Wall Climber API
A powerful API for Minecraft mods that enables advanced wall climbing mechanics for entities. This API allows mod developers to easily add spider-like wall climbing behavior to any mob.

Dynamic light
Mobs on fire and some items emit light! Like the OptiFine's dynamic light.
Zombie Horsemen
Zombie Horsemen is a Minecraft datapack that introduces a new surprise event similar to the Skeleton Trap. When triggered, a zombie riding a zombie horse, equipped with an iron helmet, iron axe, and shield, will spawn to challenge players.
Too Much XP (TME)
Yeets the laggy XP orbs, whilst still maintaining a high level count
PerformanceX
Struggling with LAG??? Look no further! PX is an All-in-one server performance suite - 50 modules including item/mob despawn timers, AI throttling, lag machine detection, auto backups, Discord webhooks, Geyser support, and more. 1.8.8-26.2.
Progressive Mob Wave Activations - PMWA
Progressive Mob Wave Activations PMWA - Mob spawns enable after a select number of days or after killing a specified mob
Mob Lite
It allows you to modify the spawn limit and the spawn limit of each specific entity in real time using commands
no_mobs_destroy_block
Prevent the destructive behavior of organisms and entities towards blocks.
MobStack26
A datapack that stacks mobs to enhance performance of large animal farms
No Duping
Various toggles for disabling dupes (rails; carpets; tnt; gravity blocks; tripwire hooks).

Call Your Friends│呼朋引伴
Use your goat horns to call your animal friends.│使用山羊角來呼喚你的動物朋友。

Nautilus Drops│鸚鵡螺掉落物
Nautilus will drop items when killed in any way.│鸚鵡螺無論以何種方式被擊殺都會掉落物品。