MythicalAC – Lightweight Server-Side Anti-Cheat

MythicalAC is a server-side anti-cheat built for Forge 1.20.1 and Paper 1.21.x that intercepts malicious packets before they can damage your survival world. It solves the constant problem of unfair players using movement exploits, combat hacks, and destructive building cheats by analyzing behavior directly from packets—no client mod required, so every vanilla player enters a fair environment.

Designed for server owners, SMP admins, and modpack creators who need protection without burdening players, MythicalAC covers a wide range of hacks: from Fly, Speed, and Phase to KillAura, Reach, Scaffold, and Nuker. Its penalty system builds a decaying violation level, applying rubber-band setbacks for early offenses, escalating to kicks and auto-bans after repeat detections. Kick counts persist across relogs, making “3 kicks = ban” a reliable rule. The anti-X-ray engine cloaks valuable ores and storage as surrounding rock, floods the void with fake ores and tunnels, and ties reveal to true position—thwarting freecam exploits without altering the world.

Every check is configurable; sensitive categories like movement or combat can be tuned per server. The live /mythicalac command lets admins inspect violations, toggle modules, and manage bans in real time. MythicalAC focuses on packet-level detection, so it excels at catching classic and modern hacks that leave a digital footprint, but it does not replace client-side integrity checks for advanced visual-only cheats. For an honest, low-overhead defense layer, it’s a solid choice.

• Movement Checks: Fly (all modes), Speed, Blink, Phase/NoClip, HighJump, Spider, NoSlow, NoWeb, FastLadder, NoFall, BoatFly, and vehicle exploits.
• Combat & Inventory Hacks: KillAura (look-angle, multi-target, through-wall), Reach, AutoClicker CPS limits, AutoTotem, and experimental aim-snap detection.
• Build & Break Checks: Scaffold, FastPlace, AirPlace/GhostBlocks, place-reach, Nuker/FastBreak.
• Escalating Rubber-Band System: Decaying violation levels, automatic kicks, and persistent ban rules (3 kicks → ban) with disk-saved state.
• X-ray & Freecam Cloaking: Ore/storage masking, fake ore/cave injection, position-keyed reveal—no world changes, pure client-side illusion.

Requirements: Minecraft Forge 1.20.1 server or Paper 1.21.x (and derivatives). No client-side mods needed. The plugin is lightweight but expects standard server hardware; extreme player counts may require tuning check intervals. Does not protect against purely visual overlays or injected clients that mimic legitimate packets perfectly—always combine with a sensible permission system.