MythicalAC

Mythical AC
A lightweight, server-side anti-cheat for Forge 1.20.1. It catches the hacks that show up in packets, and cloaks your world against the ones that don't. No client mod needed — vanilla players just join.

What it does
Movement checks
Speed · Blink / Warp / teleport · Fly (hover & illegal ascent) · HighJump · Step · Spider (wall-climb) · NoSlow · NoWeb · Fastladder · NoFall / GroundSpoof · NoClip / Phase (including through-wall) · BoatSpeed / BoatFly / vehicle Blink

Combat checks
Reach · KillAura (look-angle, through-wall, and multi-target aura) · AutoClicker (CPS) · experimental aim-snap detection

Build checks
Scaffold · AirPlace / GhostBlocks · FastPlace · place-reach · Nuker / FastBreak

Escalating punishment
Violations build a decaying level, so a stray false positive fades on its own. Confirmed cheaters get rubber-banded → kicked → auto-banned. Kick counts are saved to disk, so "3 kicks = ban" survives relogs and restarts.

X-ray & freecam cloaking
Hides your real ores and buried storage — swapped for the surrounding rock client-side, revealed only when you're right next to them (true occlusion).
Floods X-ray with fake ores and winding fake cave tunnels so the real loot drowns in noise.
Reveal is keyed to your real position, not the camera — so freecam can't fly out and reveal it either.
The world is never actually changed — it's all a client-side illusion that reverts as you approach.
Live control — /mythicalac (alias /mac)
/mac info — their flags, kicks, and violation levels
/mac pardon — clear kicks & unban
/mac check <on/off> — toggle any check without a restart
/mac obfuscation <fakeores/hide/decoys> <on/off> — flip cloaking live
Built to avoid false positives
Smart grace handling for water, boats, creative survival swaps, elytra, fast falls, ender pearls, portals, respawns, and explosion knockback.

Installation
Drop the jar in your server's mods/ folder. Server-side only — clients don't need it and can be fully vanilla.

Honest scope — please read
Mythical AC cannot detect client-side render hacks (ESP, tracers, HUDs, purely visual X-ray/freecam). No server-side anti-cheat can — those send no packets to detect. Instead of faking it, Mythical AC cloaks your world so they see nothing useful.
Cloaking uses per-block updates, so expect a brief warm-up in new areas and some bandwidth cost with many players (all tunable).
Detection thresholds may need tuning for your server. Start lenient and tighten as you watch the logs — /mac lets you adjust everything live.
Compatibility
Minecraft 1.20.1 · Forge · Vanilla-client friendly · No dependencies