Cthulhu Wars

How Cthulhu Wars works

Cthulhu Wars is an area-control game driven by a single main resource: Power.

Players spend Power to recruit Cultists, summon monsters and Great Old Ones, move units, build Gates and use faction-specific actions.

When every faction has run out of Power or chosen to stop acting, the round ends and the game cycles back through Power and Doom generation.

Victory is tied to Doom, but a faction’s six spellbooks determine both how it plays and whether it is actually eligible to win.

The round structure

The standard game flows through a small number of repeating phases:

1. Gather Power — calculate the Power available for the new round.
2. Determine First Player — priority can change.
3. Doom Phase — score controlled Gates and optionally perform Rituals of Annihilation.
4. Action Phase — players alternate spending Power on actions until everyone is done.

The rule structure is not especially long. The real learning burden is understanding what each faction can do once its spellbooks enter play.

How Power works

Power is your entire action economy.

It is primarily generated from controlled Gates and faction-specific sources during Gather Power.

Most actions cost Power. That means every summon, movement, attack or special ability competes with everything else you want to do this round.

Once your Power reaches zero, you normally stop taking meaningful actions while opponents with Power remaining continue to shape the board.

Why Gates matter

Gates are the strategic backbone of Cthulhu Wars.

They provide Power and Doom, and controlling enough Gates can dramatically accelerate a faction’s economy.

A Gate normally needs an eligible Cultist or other faction-specific controller in the area.

Because Gates are valuable every round, fighting over them is often more important than simply destroying enemy monsters.

Why Cultists are more important than they look

Cultists are weak in combat but strategically critical.

They control Gates, can be captured by enemies and are often required by faction abilities or spellbook conditions.

A faction with spectacular Great Old Ones but no protected Cultists can lose its economy very quickly.

This is a recurring beginner mistake: treating Cultists as disposable workers rather than the foundation of Gate income.

How Doom scoring works

Doom is the primary score.

During the Doom Phase, factions gain Doom from controlled Gates and other faction effects.

Players can also obtain Elder Signs, which are secret or semi-hidden Doom values until revealed according to the rules.

The game ends when the Doom-ending condition is triggered, but having the highest Doom is not enough if the faction has not satisfied its spellbook victory requirement.

What is the Ritual of Annihilation?

During the Doom Phase, eligible players may spend Power to perform a Ritual of Annihilation.

The Ritual converts economic strength into a burst of Doom and/or Elder Sign progress, but its cost rises as the game advances.

This creates a timing decision: ritual too early and you may waste Power that was needed for board control; wait too long and the Ritual becomes significantly more expensive.

How spellbooks work

Every faction has six unique spellbooks.

Each is unlocked by completing a faction-specific requirement printed on the faction sheet.

Spellbooks provide permanent abilities that can radically change movement, combat, summoning, scoring or resource efficiency.

This creates a built-in development arc: factions begin recognizable but comparatively simple, then become increasingly extreme as they unlock more spellbooks.

How do you win Cthulhu Wars?

Petersen Games’ current rules overview describes the normal endgame as the race toward 30 Doom.

However, a faction generally needs to have obtained all six of its spellbooks to be eligible to win.

That means a player cannot simply ignore faction objectives and rush the Doom track.

The best strategy balances three clocks: Power economy, spellbook progress and Doom.

How combat works

Combat is resolved with custom dice based on the Battle values of units involved.

The key results are:

• Kills — remove enemy units under the applicable rules.
• Pains — force enemy units to retreat to adjacent areas.
• Blanks — no direct effect.

Faction spellbooks frequently modify this baseline, which is why the same apparent battle strength can produce very different outcomes depending on who is fighting.

Why Pain results are strategically powerful

A Pain is not merely a failed Kill.

Forcing a unit out of an area can break Gate control, expose Cultists, prevent a faction from fulfilling a spellbook condition or move a Great Old One away from the area where its ability matters.

Because Cthulhu Wars is an area-control game, displacement can be more valuable than destruction.

How capturing Cultists changes the economy

Some units can capture vulnerable enemy Cultists rather than simply fighting them.

Captured Cultists can affect the victim’s Power generation and often provide benefits to the captor.

This is one reason leaving a Cultist alone on a Gate is dangerous even if no enemy Great Old One is nearby.

The four core factions

Great Cthulhu

Great Cthulhu is aggressive, mobile and strongly tied to oceans, combat and repeated appearances of Cthulhu himself. It is often the easiest faction for new players to understand conceptually because its threats are direct.

Crawling Chaos

Crawling Chaos, led by Nyarlathotep, is highly mobile and manipulative. It rewards players who understand opponent spellbooks and can exploit board position rather than simply seeking straight fights.

Black Goat

Black Goat emphasizes cult growth, monster presence and board saturation. It can spread pressure widely and often turns numbers and positioning into economic leverage.

Yellow Sign

Yellow Sign uses both the King in Yellow and Hastur and follows a very different scoring/board-control path built around Desecration and wandering across the map.

All seven expansion factions

Petersen Games currently identifies seven official expansion factions:

• Opener of the Way
• Sleeper
• Windwalker
• Bubastis
• Daemon Sultan
• The Ancients
• Tcho-Tchos

Combined with the four core factions, that gives 11 confirmed playable factions.

Current faction packs are typically listed around $59.99 in Petersen Games’ US store when available.

Faction expansions vs Great Old One packs

These are not the same type of product.

A Faction Expansion adds a complete playable side with its own units, spellbooks and faction rules.

A Great Old One Pack adds neutral or independent powerful entities that can be recruited or otherwise used under special rules without creating a new player faction.

There are also neutral monster packs, Terrors, alternate maps and other modular content.

What do alternate maps add?

Alternate maps do more than redraw Earth.

Examples such as Primeval, Yuggoth, Dreamlands, Great Library at Celaeno and Shaggai introduce different board structures and special rules.

Shaggai, for example, is built around a shrinking/destruction mechanic that compresses the playable area over time.

Experienced groups can therefore change the strategic geography without changing their preferred factions.

Can Cthulhu Wars play more than four?

Yes, with expansions.

The O4 core supports 2–4 players.

Petersen Games sells map/faction content that expands games to 6–8 players, and specialized map products exist for even larger tables.

Higher counts require enough playable factions plus the appropriate map expansion; buying only a fifth faction does not automatically make the standard core map suitable for five-plus players.

Is the base game good with two players?

The core box officially supports two players, but BGG community voting strongly favors higher counts, especially four.

For groups that primarily want head-to-head play, Petersen Games also sells Cthulhu Wars Duel, a standalone two-player design built specifically around that count.

The publisher currently lists Duel at $29.99.

What is Cthulhu Wars Duel?

Cthulhu Wars Duel is a separate standalone game rather than an expansion that requires the $249 core box.

The first Duel box focuses on Great Cthulhu versus Black Goat and condenses the broader faction-war concept into a faster head-to-head format.

This is the better entry point for buyers who only expect to play with two and do not need the giant miniatures or full expansion ecosystem.

What is the O4 Edition?

O4 is Petersen Games’ current major production edition of the base game.

The publisher says the O4 core contains:

• 4 playable factions
• 72 miniatures
• 5 colossal Great Old One sculpts
• A full-color mounted Earth board
• Custom dice
• Faction spellbooks/player materials

The core faction lineup remains Great Cthulhu, Crawling Chaos, Black Goat and Yellow Sign.

How much does Cthulhu Wars cost in 2026?

Petersen Games currently lists the English O4 Edition at $249.

Typical current US-store expansion pricing includes:

• Faction packs: about $59.99 each.
• Alternate maps: many around $39.99.
• Cthulhu Wars Duel: $29.99.
• 6–8 Player Map Pack O4: $99.99 in current publisher guidance.

The line contains more than 50 official expansion products and some are out of print, so availability varies widely.

What should you buy first?

For 3–4 player groups, begin with the O4 core.

It already contains four complete asymmetric factions and does not require an expansion to feel complete.

If you want more variety after several plays, a new faction pack usually adds more value than immediately buying neutral monsters or accessories because it creates an entirely new player-side rules engine.

If you only play at two, compare the $249 core against the much cheaper standalone Cthulhu Wars Duel before committing.

Cthulhu Wars vs Cthulhu: Death May Die

Cthulhu Wars vs Blood Rage

Blood Rage is another high-interaction area-control game with large miniatures, but its core engine is card drafting and action efficiency rather than spellbook asymmetry.

Cthulhu Wars gives players more faction-specific rules and a larger premium-miniature footprint. Blood Rage is usually faster to set up, cheaper to buy and more focused on drafting and tactical timing.

Cthulhu Wars vs Forbidden Stars

Forbidden Stars is heavier and more procedural, using programmed orders and multi-step combat.

Cthulhu Wars is more direct: spend Power, move/summon/fight, unlock spellbooks and pressure Gates.

Choose Forbidden Stars for elaborate Warhammer 40K strategic planning; choose Cthulhu Wars for faster turns and deeper faction asymmetry.

Eight strategy principles for new players

• Protect the Power economy first. A flashy Great Old One cannot compensate for losing every Gate.
• Know all six spellbook requirements before round one. Faction development is part of the victory condition.
• Spend Power with initiative in mind. Being the only player with Power left can be extraordinarily strong.
• Do not judge battles only by expected Kills. Pain results can steal Gate control or wreck positioning.
• Time Rituals rather than performing them automatically. Doom is useful only if the Power cost does not surrender the board.
• Learn rival spellbooks. Much of Cthulhu Wars’ skill ceiling is knowing what the other factions can suddenly do.
• Attack economies, not miniatures. Capturing or displacing Cultists can be more damaging than killing a monster.
• At four players, use diplomacy selectively. Temporary alignments are useful because the leader changes as Doom, Power and spellbooks develop.

Eight things to know before buying

• The core box is expensive at $249.
• Four players is the community-favored count.
• The base game is complete without expansions.
• Expansion factions are the biggest rules additions.
• Some of the 50+ expansion products are out of print.
• Higher player counts need both enough factions and appropriate map support.
• Cthulhu Wars Duel is standalone. It does not require the O4 base game.
• There is no official solo mode in the standard base game.

Cthulhu Wars FAQ

How many players?

The O4 core supports 2–4 players. Expansions can support larger groups.

How long does it take?

BoardGameGeek lists approximately 90–120 minutes.

Who designed Cthulhu Wars?

Sandy Petersen and Lincoln Petersen.

What are the four core factions?

Great Cthulhu, Crawling Chaos, Black Goat and Yellow Sign.

How many playable factions are there?

Petersen Games currently lists 11 confirmed playable factions: four core plus seven faction expansions.

How many spellbooks does each faction have?

Six.

How do you win?

Race toward 30 Doom while also satisfying the spellbook-based eligibility requirement.

What is the Ritual of Annihilation?

A Doom-phase action that spends Power to accelerate Doom/Elder Sign scoring, with increasing cost as the game progresses.

What is the best player count?

BGG community voting strongly favors four players.

Is Cthulhu Wars still available in 2026?

Yes. Petersen Games currently lists the O4 Edition at $249.

Is Cthulhu Wars Duel an expansion?

No. It is a separate standalone two-player game.

Can Cthulhu Wars play eight?

Yes, with enough faction expansions and the appropriate 6–8 player map product.

Sources and scope

• Petersen Games: current rules overview, Power, Gates, spellbooks, Doom and 30-Doom endgame
• Petersen Games: setup/rulebook overview, combat, Elder Signs and faction references
• Petersen Games: 2026 O4 availability and $249 price
• Petersen Games: all 11 playable factions
• Petersen Games: seven expansion factions
• Petersen Games: faction packs vs Great Old One packs, Terrors and Duel products
• Petersen Games: core and expanded player counts
• Petersen Games: Shaggai and 6–8 player expansion requirements
• BoardGameGeek: current rank, ratings, player count, play time and complexity

Checked October 10, 2026. Cthulhu Wars has a very large expansion catalog and some products are periodically out of print, so this guide separates core rules from optional faction, neutral-unit and map products. Current pricing refers to Petersen Games’ 2026 listings and may change. Strategy and buyer guidance are original editorial analysis; no firsthand review or playtest is claimed. Editorial policy and corrections.