The Lich: Lore, Stats, and Running the Ultimate Undead Villain
A lich doesn't just wander into a campaign — it arrives with centuries of backstory, a phylactery buried somewhere inconvenient, and the kind of tactical patience that only comes from having already died once on purpose. This page covers the lich's defining traits across D&D editions, how its mechanics actually function at the table, the most common ways it appears in play, and the decisions a Dungeon Master faces when deploying one. Whether it's a one-session boss or the architect of a year-long arc, the lich rewards preparation.
Definition and scope
In Dungeons & Dragons, a lich is a spellcaster — almost always a wizard, though warlocks and clerics appear in expanded lore — who has voluntarily undergone a ritual transformation into undeath. The core of that transformation is the phylactery: a physical object, typically described as a small box or amulet, that houses the lich's soul. Destroying the lich's body without destroying the phylactery simply delays the problem by 1d10 days (D&D 5e Monster Manual, p. 202), at which point the lich reconstitutes itself near that hidden anchor.
The 5th edition Monster Manual assigns the lich a Challenge Rating of 21, placing it firmly in the tier of threats appropriate for parties of 17th level and above. Its stat block reflects that weight: 135 hit points, an Armor Class of 17 (natural armor), and a suite of legendary and lair actions that make it behave less like a single enemy and more like a small tactical event. For a deeper look at how those mechanics layer together, the legendary actions and lair actions breakdown is worth examining alongside this entry.
The lich is classified as undead, with immunity to poison and the poisoned condition, immunity to cold, lightning, and necrotic damage, and resistance to nonmagical bludgeoning, piercing, and slashing — a damage profile that punishes underprepared parties who show up swinging mundane weapons.
How it works
The lich's combat engine runs on three overlapping systems:
- Spellcasting. The lich casts as an 18th-level wizard with a spell save DC of 20 and a +12 spell attack bonus. Its prepared spell list typically includes power word kill, time stop, finger of death, and disintegrate — spells calibrated to end adventurers quickly and dramatically.
- Paralyzing Touch. Its melee attack deals 3d6 cold damage and forces a DC 18 Constitution saving throw against paralysis, which lasts up to 1 minute (repeated saves allowed). A paralyzed character is automatically critically hit by any melee attack in range — a combination that can collapse a fight before the lich burns a single spell slot.
- Legendary Actions. The lich gets 3 legendary actions per round, drawn from a menu that includes cantrip attacks, an additional Paralyzing Touch, and a Frightening Gaze that forces DC 18 Wisdom saves against the frightened condition for up to 1 minute.
The lair itself contributes 3 additional regional effects and lair actions — cold spots, whispers that cause the frightened condition, and screaming specters — that extend the lich's mechanical footprint well beyond its turn. The full undead monsters guide covers how liches compare structurally to other high-end undead like vampires and death knights, but the short version is this: no other undead in the core rules combines persistent regeneration, arcane dominance, and environmental control at this power level.
Common scenarios
Liches appear in D&D scenarios along a fairly predictable spectrum:
The Final Boss Arc. The party discovers the lich's influence through layers of proxies — cultists, undead minions, politically compromised nobles — before ever confronting the lich directly. The phylactery hunt becomes a parallel quest thread. This structure works especially well because the challenge rating system only accounts for a single encounter; the lich's true threat is the campaign-level attrition it creates before the climactic fight.
The Reluctant Ally. Some settings position a lich as a lesser evil — an ancient archmage with a functional self-interest in preventing something worse. Vecna, arguably the most famous lich in D&D lore, began as a mortal wizard in the World of Greyhawk setting before ascending to demigod status across editions. That trajectory gives DMs a template for liches with legible, if horrifying, motivations.
The Demilich Twist. A demilich — statted separately in the Monster Manual at Challenge Rating 18 — represents a lich that has neglected its body to the point of physical dissolution, retaining only a skull. It reads as a weaker version, but its Howl action forces every creature within 30 feet to make a DC 17 Constitution save or drop to 0 hit points, which has ended more than one overconfident encounter.
Decision boundaries
The choices that shape how a lich plays at the table break down into three distinct categories:
Phylactery placement. A phylactery hidden in the Astral Plane or a demiplane creates an essentially unsolvable problem until the party can access those locations. One hidden in a dungeon beneath the lich's tower creates a race condition during the final encounter. Neither is wrong — they produce very different games.
Intelligence in combat. A lich with 20 Intelligence and 17 Wisdom does not stand still and trade blows. It casts greater invisibility, repositions via misty step, targets the party's weakest Constitution saves first, and retreats if the encounter is going badly. DMs who play liches passively are leaving CR 21 on the table. The boss monster design tips resource addresses this tactical framing directly.
Motivation clarity. The most compelling lich villains have a goal the party can understand even while opposing it — completing a ritual, achieving true godhood, reversing something that was done to them. The monster manual lore and worldbuilding section of the broader Monster Manual reference hub explores how published settings handle villain motivation at this scale.
A lich without a reason is just a difficult fight. A lich with one is a campaign.