Ultima Online.AI

Britannia, restored — and remembering.
CONSULTING… Players: — NPCs: — Uptime: —
Era: T2A · 1998 PLAY →
ONE CLICK · IN BRITANNIA · NO ACCOUNT · NO FEES

Install & Play

Pick your platform.

WINDOWS
One-Click Installer
Downloads ClassicUO + auto-detects your UO data + writes config + launches. Done in 60 seconds.
↓ install-uo.bat
Requires UO Renaissance to be installed first. Get it here if you don't have it.
MAC & LINUX
Manual Setup
No one-click yet — see the four steps below. Takes ~10 minutes.
↓ Manual steps below
Or run on Windows for the easiest experience.
OR · MANUAL STEPS
1
DOWNLOAD CLASSICUO
The free open-source client. Download and unzip — no installer needed.
macOS .zip Windows .zip Linux .zip
Unzip into a folder you'll remember (e.g. ~/ClassicUO/ or C:\ClassicUO\).
2
DOWNLOAD UO ART
ClassicUO needs the game's art and maps. Use the UO Renaissance installer (~340 MB).
UO_Renaissance.exe
Windows: run the installer, note where it installs (default: C:\Program Files\UO Renaissance). You can uninstall after — only the data folder matters. Mac: open the .exe with The Unarchiver to extract files without running it. Save the extracted .mul files in a folder like ~/Desktop/Ultima Online/.
3
EDIT SETTINGS.JSON
Open settings.json in the ClassicUO folder with any text editor. Replace these five values:
"ip": "play.ultimaonline.ai",
"port": 10000,
"ultimaonlinedirectory": "path to your UO art folder",
"clientversion": "1.26.4",
"ignore_relay_ip": true
If settings.json doesn't exist yet, run ClassicUO once and it will create one.
4
LAUNCH & PLAY
Win Double-click ClassicUO.exe
Mac Open Terminal in the ClassicUO folder, then: arch -x86_64 ./ClassicUO.bin.osx
Linux Run ./ClassicUO.bin.x86_64
At the login screen, type any account name + password — the server creates the account on your first login. Then create a character, pick Britain to start, and walk out into the world.
SERVERplay.ultimaonline.ai PORT10000

The Shard Stands Open

— GENESIS · ANNO ORIGIN MCMXCVIII —

Welcome, traveller, to Ultima Online.AI — a faithful reconstruction of Ultima Online: The Second Age as it stood on the morning of 2 June 1998, the day Origin Systems' production data was extracted and preserved.

The shard runs draxinar/ouo, a clean-room reverse engineering of the 1998 server compiled function-for-function from UoDemo.exe. The world data, NPC scripts, item resources, region map, and weather zones are Origin's production files, unaltered. The Halberd hits for 4d12. Mages drop reagents. Beggars roll 3d2 hit points. Town Guards have 100d1 notoriety — perfectly lawful, mathematically.

This is not a re-imagining. This is a recovery.

FULL LOOT OPEN PVP NO TRAMMEL NO INSURANCE NO ITEM SHOP NO RESETS NO FEES

How to Enter Britannia

— FOUR DOWNLOADS · ONE SETTINGS —

I. ClassicUO. The community-built modern client. Open source, no installer. Download here for macOS, Windows, or Linux.

II. UO Renaissance data. ClassicUO does not bundle the world's art and maps. Get them from any free shard's installer — fastest path: UO_Renaissance_Client_Full.exe (~340 MB). On macOS, open with The Unarchiver to extract the .mul files without running the .exe.

III. Configure. Edit settings.json next to the ClassicUO binary. Five lines:

"ip": "play.ultimaonline.ai",
"port": 10000,
"ultimaonlinedirectory": "/path/to/your/UO/data",
"clientversion": "1.26.4",
"ignore_relay_ip": true

IV. Launch. macOS: arch -x86_64 ./ClassicUO.bin.osx. Windows: double-click ClassicUO.exe. Invent any account name and password at the login screen — the shard creates the account on first sight.

What Awaits Thee

— EXTRACTED FROM THE 1998 WORLD DATA —
  • 15 cities with their NPC dialogue scripts
  • 49 skills with their original stat curves
  • 72 NPC professions from bank/jobs
  • 8 dungeons · Covetous, Deceit, Despise, Destard, Hythloth, Shame, Wrong, Ice
  • 8 virtue shrines + Chaos Shrine
  • 1,606 named regions with X,Y bounds
  • 107 NPC dialogue scripts (.frg) by Origin's writers
  • 1,635 wombat scripts — game logic from June 1998
  • 216 weapon definitions with literal T2A damage dice
  • 25 monster families × 5 size variants ≈ 125 creatures
  • 65 spell + magic scripts · the full magery system
  • 62 housing scripts · placement, decay, deeds
  • 53 teleport scripts · 8 moongates + dungeon network
  • 7 quest scripts · deliver / fetch / murder system

Establishments by their names: Empath Abbey · Bloody Bowman · Bloody Thumb Woodworks · Brothers in Arms · Plenty O' Dough · The Blue Boar Tavern · Sweet Dreams Inn · The Wayfarer's Inn · The Salty Dog · The Unicorn's Horn · The Cat's Lair · Ethral Goods Magic Shop · Bank of Britannia · Britain Public Library · Britain Sewer · Silver Serpent Bows · The Broken Arrow Inn · The Dog and Lion Pub · Fisherman's Brew · Tinker of the Isle · Britannian Herbs.

Economy

— GOLD · TRADE · THE EIGHT REAGENTS —

How to make gold. Britannia's economy is built on hunting, crafting, and trade. There is no item shop. Every gold coin in thy purse is something thou hast taken or made.

  • Hunt monsters — every creature drops gold per their template (small spawns 5-30gp, dungeon mid-tier 50-200gp, daemons & dragons 1000+gp)
  • Loot corpses — mages drop reagents, paladins drop arms, brigands drop stolen goods. Tracked per-NPC by a cumulative loot counter
  • Sell to vendors — every shopkeeper buys his guild's goods. Stock counters reset every 200 ticks (~3 minutes)
  • Treasure maps — dig at the X, kill the guardians, claim the chest. Driven by treasurecomp.m and the trapped-chest scripts
  • Crafting — fletcher · smith · alchemist · scribe · tinker · carpenter · cook · tailor · grapevine · flourmill
  • Quests — NPCs ask for delivery (fetch X to Y), fetch (bring X back), or murder (assassinate target). 7 quest scripts

Banks & banker NPCs. Every city has a banker. Speak the keyword bank to open thy box; balance to check thy gold; withdraw N to draw funds. When buying from any vendor, gold is auto-deducted from thy bank — thou shalt hear The total of thy purchase is N gold, which has been drawn from your bank account. My thanks for the patronage. If overdrawn: Begging thy pardon, but thy bank account lacks these funds.

Vendor markup. Vendors price by item resource ratio (Vendor_GetMarkupPercent). Buying is dearer than selling — that's the merchant's profit, the same model Origin shipped in 1998. Stock has a max per item type; once depleted thou must wait the restock counter.

The Eight Reagents of Magery

All spell-casting requires reagents. Carry a stocked bag — running out mid-cast fizzles the spell. Buy from any alchemist or mage shop. Loot from dead mages. Find on Mandrake Root and Nightshade plants in the wild.

ReagentFound in spells like
Black PearlMagic Arrow · Lightning · Flame Strike · Energy Bolt
Blood MossBless · Curse · Magic Reflection · Recall · Gate Travel
GarlicCure · Arch Cure · Heal · Greater Heal · Recall
GinsengHeal · Greater Heal · Mass Curse · Wall of Stone
Mandrake RootMass Curse · Earthquake · Polymorph · Energy Vortex
NightshadePoison · Magic Trap · Mass Curse · Mind Blast
Spider's SilkBless · Magic Lock · Wall of Stone · Energy Field
Sulfurous AshMagic Arrow · Fireball · Explosion · Flame Strike

Geography

— THE EIGHT MOONGATES · 1,606 NAMED REGIONS —

Eight Justice-virtue moongates connect Britannia. The phase of the moon dictates which gate opens to which destination. Coordinates below are the literal world tiles from uogolddemo/regions.txt.

GateCoords (X, Y)Region
Yew761, 741forest west · Empath Abbey nearby
Britain1330, 1991capital · Lord British's Castle
Skara Brae638, 2062island west · the ranger town
Trinsic1823, 2943south · paladin city
Jhelom1494, 3767island south · fighter town
Minoc2694, 685north mountains · the miners
Magincia3554, 2132island east · merchants
Moonglow4480, 1056island far east · mages

Per-city density from the region table: Britain 136 · Jhelom 74 · Moonglow 71 · Vesper 60 · Skara Brae 55 · Trinsic 52 · Minoc 47 · Yew 45 · Nujel'm 43 · Wind 42 · Magincia 32 · Serpent's Hold 25 · Buccaneer's Den 22 · Papua 20 (Lost Lands) · Cove 19 · Delucia 13 (Lost Lands).

The Eight Virtues

— THE MORAL SPINE OF BRITANNIA —

Each virtue has a shrine in Britannia. The Codex of Ultimate Wisdom binds them all. Thy character's standing in the eight virtues shapes how NPCs respond — the three-attitude system (Wicked · Neutral · Goodhearted) that the dialogue scripts branch on.

VirtueCompanion stat
CompassionLove
HonestyTruth
HonorTruth · Courage
Humilitynone — the absence of pride
JusticeTruth · Love
SacrificeLove · Courage
SpiritualityTruth · Love · Courage (all three)
ValorCourage
Chaosthe opposing principle · Chaos Shrine

The Bestiary

— SPAWN DENSITY · CREATURE × REGION —

Every creature spawns at the rate Origin Systems calibrated. The numbers below are the literal weights from bank/dungn and bank/near.

CreatureHPDungnDark ForestMtnSwampCmty
Sewer Rat2d5+920————
Giant Rat3d15+1910————
Headless1d25+256108——
Mongbat1d25+55510———
Skeleton1d25+55610———
Zombie—6———5
Ghost1d25+75—18——5
Lizardman1d25+8538—1—
Giant Spider1d25+758————
Earth Elemental1d30+12533———
Gargoyle1d30+145—9———
Daemon—5————

25 monster families, each with 5 size variants from SMALL → LARGE + 2 boss tiers: Corpser · Daemon · Dragon · Ettin · Gargoyle · Gazer · Ghost · Giant Spider · Giant Rat · Giant Scorpion · Harpy · Headless · Lich · Lizardman · Mongbat · Ogre · Orc · Ratman · Reaper · Sea Serpent · Skeleton · Slime · Troll · Wisp · Zombie. Plus Air, Fire, and Earth Elementals.

Voices of Britannia

— DIALOGUE BY ORIGIN, 1996—1998 —

NPCs speak from convo/*.frg scripts authored by Origin's writers. The three-attitude system — Wicked, Neutral, Goodhearted — is in the data: same NPC, same question, three responses depending on thy moral standing.

THE INNKEEPER
— by Raph · Raph Koster, lead designer of Ultima Online
I am an innkeeper, $milord/milady$. Ah! Thou doth speak of Empath Abbey! I'm fairly sure that it can be found just outside of Yew.
THE MAGE · ON RELVINIAN
— by Andrew Morris · revised 16 March 1996
Relvinian was a mage driven mad by the Daemons he attempted to control. He became so afraid that others were attempting to steal his research that he fled Britain and drew upon his powers to create a magical maze pulled from all areas of the world to protect himself from watchful eyes.
THE BRIGAND · BY ATTITUDE
— by cwm · 34 files attributed
WICKEDNone of thy business.I do THIS! [Attack]
NEUTRALI'm sort of like a porter. I lighten the burdens of rich travelers.
GOODHEARTEDI do what I must to get by, just as we all do.
THE PIRATE
— by cwm
I've sailed with the best captains on the sea! 'Course, they're all dead, now.

ORIGIN'S WRITING ROOM: cwm · Dab · MMT · Raph Koster · Andrew Morris · Kristen Koster · JLS — across ~107 dialogue scripts. The Kosters worked together at Origin Systems on Britannia's NPC voice.

By the Numbers

— THE MATH BENEATH BRITANNIA —
EntitySTRHPNote
Common Citizen1d25+751d25+75Hardy townfolk · 76-100 HP at spawn
Beggar1d43d23-6 HP. Frail. Don't fight, run.
Sewer Rat2d5+92d5+911-19 HP. Newbie quarry.
Earth Elemental1d30+1251d30+125126-155 HP + mana. Bring company.
Gargoyle1d30+1451d30+145Higher than EE. Real threat.
Town Guard——NOTORIETY 100d1 · always 100, mathematically perfect lawful. Why thou cannot fight them.

HP regeneration: hpRegenTimer = 100 + (hungerCapacity − stomach) × 10. Translation: well-fed regenerates faster, hungry slower. Real food matters.

A Dispatch from Origin · 2 June 1998

— FOUND WITHIN THE WORLD DATA —

Inside rundir/update.txt — the patch-notes file shipped with Origin's production server data. Reproduced unaltered:

We are ready to continue the implementation of the Reputation System.

Today is the second phase of the process, which is publishing to a single server. We will be updating the Great Lakes Shard at 2:00 CST today. We will be monitoring this server closely throughout the day.

If everything runs normally, we will continue to the third phase of the process on Thursday by updating the remaining public servers. — Origin Systems internal notes, 2 June 1998. The same file is read by ouo at boot in 2026.