Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
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## Summary Implements T2A-accurate mechanics for the three defensive spells based on UO98 demo scripts. Pre-UOR (`!Core.UOR`) triggers the new behavior; UOR and AOS paths are unchanged. - **Reactive Armor**: percentage-based melee damage reflection (10-35% based on target Magery), targeted, timed (25-75s). Guards exempt, ranged attacks beyond 1 tile unaffected. Reflected damage is sourceless. - **Protection**: temporary AC bonus (casterMagery/10, 1-10 AR) via VirtualArmorMod, targeted, timed (12-120s). Shared table with Arch Protection — only one protection buff per mobile. - **Magic Reflect**: single-use spell reflection using MagicDamageAbsorb as a flag. No timer, no DefensiveSpell lock. Consumed on first reflected spell. - **Arch Protection**: T2A path applies Protection via shared table with area sound (0x1F7 vs 0x1ED). - No DefensiveSpell mutual exclusion for T2A — all three spells operate independently. ## Test plan - [x] Set expansion to T2A - [x] Cast Reactive Armor on self → verify particles (0x376A) and sound (0x1F2) - [x] Get hit in melee → verify attacker takes reflected damage with spark effect and sound - [x] Get hit by ranged weapon from > 1 tile → verify no reflection - [x] Wait for RA to expire → verify effect ends silently - [x] Cast RA on target that already has it → verify "This spell is already in effect" - [x] Cast Protection on another player → verify particles (0x375A) and sound (0x1ED) - [x] Check target's AR → verify it increased by casterMagery/10 - [x] Wait for Protection to expire → verify AR returns to normal - [x] Cast Protection on self, then cast Protection on another player → verify both succeed - [x] Cast Arch Protection on ground near allies → verify each gets AR bonus with sound 0x1F7 - [x] Cast Arch Protection near a target already protected → verify that target is skipped - [x] Cast Magic Reflect on self → verify particles (0x375A) and sound (0x1E9) - [x] Have an enemy cast a harmful spell at you → verify spell reflects back, effect consumed - [x] Cast Magic Reflect again → verify it can be recast after consumption - [x] Cast Magic Reflect when already active → verify "This spell is already in effect" - [x] Verify all three spells can be active simultaneously on the same mobile - [x] Switch expansion to UOR → verify existing UOR behavior unchanged - [x] Switch expansion to AOS → verify existing AOS behavior unchanged |
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| .github | ||
| dev-docs | ||
| Distribution/Data | ||
| docs | ||
| Projects | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| mkdocs.yml | ||
| ModernUO.sln | ||
| publish.cmd | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
- Run
./publish.cmd [release|debug (default: release)] [os] [arch (default: x64)]os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit (Windows not supported)
Linux Prerequisites
Fedora, CentOS, RHEL, etc
dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
