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Advanced Wall Climber API

by Nyfaria

Advanced Wall Climber API gives mod developers a library for wall-climbing mobs, letting their entities walk across walls, ceilings and other surfaces.

FabricForgeNeoForgeClient and serverAll rights reserved1.12.2 – 26.1

What it does

Nyfaria's library supplies the mechanics for entities that climb like spiders. A developer builds on it to give a mob the ability to move over vertical faces and overhead surfaces, rather than writing that behavior from scratch. The API is the part that makes this possible, and it is aimed at mod authors, not at players who only want to add a mob to their world.

Installation requires Fabric API. Advanced Wall Climber API is published for Fabric, Forge and NeoForge and runs on client and server, so the server and every player need it. Files cover 1.12.2, 1.20.1, 1.21.1, 1.21.5, 1.21.11 and 26.1, with the latest builds at 1.0.2 for 26.1 on Fabric and NeoForge and 1.0.3 for 1.20.1 on Forge. The mod is released under All rights reserved and is not open source, though its source code, issue tracker and wiki are public. Mutants and Zombies is one of the mods that depend on it.

Key features

  1. Full 3D wall climbing

    Entities can walk on walls, ceilings and other surfaces, not only flat ground.

  2. Smooth orientation transitions

    A climbing entity turns its body as it moves from one surface to another, so the change looks natural.

  3. Custom pathfinding

    The pathfinding system accounts for 3D movement, letting mobs plan routes across vertical and overhead terrain.

  4. Render helpers

    Rendering utilities keep a model oriented correctly while it climbs, without manual math by the developer.

Compatibility

Latest build for each game version and loader.

26.11.0.2Not available1.0.2
1.21.111.0.3Not available1.0.3
1.21.51.0.3Not available1.0.3
1.21.11.0.3Not available1.0.3
1.20.11.0.31.0.3Not available
1.12.2Not available1.0.6Not available
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

Required by 1 mod

Mutants and Zombies1.12.2 – 26.3

How it compares

Full comparison

Hostile Climbers is a Fabric-only server-side mod for 1.20.1 – 1.21.1, released under the MIT License and open source. The Climber is a Forge mod for 1.20.1 that runs on client and server and is not open source. Pick Climber is a NeoForge mod for 1.21.1 with the same client and server environment, under All rights reserved. Advanced Wall Climber API differs by being a library for developers rather than a finished mob.

ModLoadersGame versionsEnvironmentUpdated
Advanced Wall Climber APIFabric, Forge and NeoForge1.12.2 – 26.1Client and server2026-09-29
Hostile ClimbersFabric1.20.1 – 1.21.1Server-side only2026-02-18
The ClimberForge1.20.1Client and server2026-04-29
Pick ClimberNeoForge1.21.1Client and server2026-09-28

Questions

Does Advanced Wall Climber API need Fabric API?

Yes. Fabric API is a required dependency, so it must be installed alongside this library on Fabric.

Does the server need Advanced Wall Climber API?

Yes. The server and every player need the mod installed.

Which versions does Advanced Wall Climber API support?

Files exist for 1.12.2, 1.20.1, 1.21.1, 1.21.5, 1.21.11 and 26.1. The newest builds target 26.1 on Fabric and NeoForge and 1.20.1 on Forge.

More from Nyfaria

All projects
Nyf's Spiders1.12.2 – 26.1Nyf's Quivers1.16.5 – 1.21.1Mana Unification1.20.1Nyf's Wearable Backpacks1.20.1Bats Galore1.20.1Nyf's Modpack Version Check1.20.1

What the author says

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.
Nyfaria, on the Modrinth page

Official listing

Owner
Nyfaria
Published
2026-01-10
Updated on Modrinth
2026-09-29
Facts verified
2026-10-15
Open on ModrinthCompare