Mana

Mana is the magical-energy resource pool every character and creature in Ultima Online draws on to cast spells, trigger Special Moves, activate Skill Masteries, and pay the running cost of forms like Vampiric Embrace and Lich Form. It is one of the three character pools — alongside Hit Points and Stamina — and the one most heavily shaped by the modern item-property system: a mage's mana economy is the joint output of Intelligence, Mana Increase, Mana Regeneration, Lower Mana Cost, Meditation, Focus, and the medable-vs-non-medable armor distinction that gates active meditation. Every spell-school identifies its own combat tempo by how aggressively it spends mana versus how fast it refills, and every mage suit is built first and foremost around getting that ratio right.

This page is the canonical reference for the mana pool itself: how it is calculated, how it regenerates, the modifiers that scale that regeneration, and the systems that consume it.

What mana is

Even non-magical creatures have mana — the Reaper carries an average of 176 (it casts spells), while the Earth Elemental sits at ~82 (its Mana Drain attack draws from the player into its own pool). Pet Animal Taming targets like Cu Sidhe and Hiryu carry mana for their special abilities, which is one of the levers the Pet Training system tunes.

Mana Regeneration — the formula

Mana regeneration is the single most-discussed mechanic in mage build construction. The formula is multi-stage, with three primary skill/stat inputs and several gear/state modifiers:

Combining the layers, a representative top-tier mage regen rate runs:

Passive (no trance), 100 INT, 100 Med, 100 Focus, +18 MR:
  0.2  (base)
  + 100/200 = 0.5  (Focus)
  + ((100 × 3 + 100) / 400) × 1.1 = 1.1  (Med-speed × GM bonus)
  + 18/10 = 1.8  (MR cap)
  = 3.6 mana/sec

Active meditation (trance), same stats:
  0.2 + 0.5 + (1.0 × 1.1 × 2.0) + 1.8 = 4.7 mana/sec

A 100-INT mage with a 150 mana pool refills from 0 to full in ~32 seconds passively, ~32 seconds in active trance. The big difference is what active meditation costs: the trance interrupts on damage, on movement, on speech, and on weapon swing — so active meditation is for between-fight refills, not in-combat regen.

Medable vs. non-medable armor

The single biggest gating factor on regen rate is the medable armor flag:

If a non-medable piece is equipped while the character attempts to enter active meditation, the system displays "Regenerative forces cannot penetrate your armor." and the trance fails to start. The medable-armor restriction was the single biggest reason the Stone Plate Armor set (which is Mage Armor by default) became canonical for hybrid melee-mage builds — see Stone Plate Armor for the full set.

MR cap and the +9 / +18 transition

The Mana Regeneration item property has a cap of +18 on character — six pieces at +3 each gets you most of the way there, plus any artifact bonus. Pre-Pub 46 the cap was effectively +9 (an item-tier rule). The post-Pub 46 system raises it to +18 with a soft tier:

• +1 to +9 MR: each point fully contributes (+0.1/s per point).
• +10 to +18 MR: each point still contributes (+0.1/s per point), but the cumulative diminishing-returns curve means there's effectively a +18 ceiling — you cannot exceed it from gear alone.

Imbuing caps individual MR property at intensity 9 per slot. Three +3 MR rings + a +3 MR bracelet + a +3 MR talisman = +12, then a +6 MR artifact closes the gap to +18.

Mana consumption — the spend side

The other half of the mana economy is how much each spell costs. The cost matrix is per-spell-school:

Lower Mana Cost is a flat % reduction across all schools, capped at 40% from gear. A 50-mana spell at 40% LMC costs 30 mana; a 9-mana spell costs 5.4 → 5 (round down, minimum 1).

Special Moves carry a flat mana cost depending on the move tier (Primary 20 / Secondary 30 / Mastery 40 typical), modified by Mana Phasing Orb artifacts and Tactics-skill thresholds.

Mana drain and leech

Hit Mana Drain and Hit Mana Leech are the two combat-side mana economy levers:

Hit Mana Leech is the canonical mana-economy fix for melee mages and pure casters using Mage Weapons: a Magery-Mage Weapon with high HML + Damage Increase replaces active meditation with passive-on-swing mana refills, allowing constant high-cost casting (Energy Bolts, Flame Strikes) without ever pausing to meditate.

Sources of mana refill that bypass regeneration

A few systems restore mana outside the regeneration formula:

• Vampiric Embrace — life-leech grants ~25% of damage as HP and a small mana-trickle in some implementations.
• Mana Phasing Orb artifact — chance-on-hit to refund some mana cost of next spell.
• Mana Drain (offensive) — Necromancy Mana Drain spell drains target's mana directly into the caster's pool.
• Spirituality Shrine + Ankh Pendant chant "Om" — +1 to all three regenerations (HP, Stamina, Mana) for one hour, with 25% chance to bump one to +2.
• Spellweaving Tribute — group-cast Tribute mastery refills mana for all participants.
• Skill Mastery passive abilities — several mastery passives include mana-economy benefits (e.g., Mage's Wizardry ability shores up mana cost on Magery casting).

See also

• Mana Increase — the mana-pool item property (cap +25).
• Mana Regeneration — the regen-rate item property (cap +18).
• Lower Mana Cost — the spend-side discount (cap 40%).
• Meditation — the regen-multiplier skill, including the medable-armor gate.
• Focus — the warrior-friendly regen alternative.
• Intelligence — the stat input to mana pool size.
• Hit Mana Leech and Hit Mana Drain — the combat-side mana economy.
• Vampiric Embrace, Ankh Pendant — alternative mana-restore paths.
• Hit Points and Stamina — the other two character pools.
• Magery, Necromancy, Spellweaving, Mysticism, Chivalry — the principal mana-spending spell schools.
• Bushido, Ninjitsu, Tactics — the warrior schools that draw mana for special moves.