Buildings

Extracts adamantium ore from the planet's crust.

Cultivates and stores precious gene-seed for Astartes creation.

Mechanicum-chartered mining consortium. +25% adamantium production, -10% promethium. Exclusive with Refinery Guild.

Refines volatile promethium for fuel and energy.

Mechanicum-chartered refinery consortium. +25% promethium production, -10% adamantium. Exclusive with Mining Guild.

Unlocks advanced technologies and generates research points. Each lab level also speeds up research by +0.2% empire-wide, capped at +10% from labs alone (≈50 lab levels). Stacks ADDITIVELY with captain talents, V2 research nodes, item buffs, and faction reductions — total speed reduction across all sources is capped at 33%.

Codex-compliant supply optimization center. Boosts all resource production on this planet by 5%. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Harnesses the planet's core heat for supplemental power.

Generates immense power via controlled plasma fusion.

Trains infantry units. Higher levels unlock stronger unit types.

Battle-automata production hall — Castellax / Arlatax / Vorax / Scyllax / Vultarax / Thallax / Ursarax / Domitar. Higher tiers unlock the heavier walkers. Each level adds 3 recruit slots; L10 fields 30 simultaneous automata builds. The Astartes-side equivalent is the Machine Cult, which Mechanicum forge worlds cannot construct.

Cybernetica academy where the Mechanicum trains Datasmiths — hero units that aura-buff Automata in their fleet (+20% WP / +15% HP, soft-capped at +40% / +30% across all Datasmiths in the same fleet). Each level adds 3 Datasmith recruit slots — L10 fields 30 simultaneously.

Constructs armored vehicles — Predators, Land Raiders, Dreadnoughts. Higher levels unlock heavier chassis.

Builds void warships. Escorts consume 2 slots, cruisers consume 3, Strike Cruisers consume 4, Battle Barges and Glorianas consume 5. The shipyard builds as many in parallel as your free slots allow. Fighters, gunships, and transports each consume 1 slot and queue normally. Max 6 slots at L8 (Astartes) or 30 slots at L10 (Mechanicum tall-economy extension).

Mechanicum siege-engine cradle. Produces Thanatar / Thanatar-Calix / Karacnos / Krios Venator (siege-class units). The Dragon Eternal Glaive super-heavy is Mezoa's unique product at L5. Each level adds 3 recruit slots — L10 fields 30 simultaneous siege builds.

Mechanicum infantry barracks — trains Tech-Thrall conscripts and Secutarii (Hoplite line, Peltast skirmisher) maniples. Each level adds 3 recruit slots; L10 fields 30 simultaneous infantry builds. The Astartes-side equivalent is the Barracks, which Mechanicum forge worlds cannot construct.

Cathedral-foundry for Knight Houses and Titan god-engines. Higher tiers unlock progressively larger chassis (Knights at L1, Warhound at L1, Reaver at L3, Warlord at L5, Imperator at L5 + Lane 5 Apex). Each level adds 3 recruit slots — at L10 the forge fields 30 simultaneous god-engine builds. Mezoa cannot construct this building.

Produces toxins and hardening agents that bolster infantry durability. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Fenrisian weapons forge producing brutal close-combat armaments. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Decentralized intelligence network for espionage and sabotage. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Psychic research facility unlocking warp-enhanced technologies. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Advanced fabrication facility producing augmented vehicle plating. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Training arena where warriors hone flawless combat techniques. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Master forge channeling volcanic energy into superior weapons. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Inner Circle sanctum. Enhances combat performance through secret rites. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Sacred hall where the Blood Angels channel their aerial fury. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Covert operations center coordinating precision strike missions. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Manufactures siege ordinance and fortification-breaching equipment. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Vast training grounds for lightning warfare and rapid assault drills. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Zealous shrine accelerating planetary compliance and devotion. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Broadcasts fear-inducing signals that demoralize enemy forces. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Strategic command post for coordinated fleet operations. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Gladiatorial arena fueling the Nails-driven fury of the XII Legion. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Ground-layer anti-armor emplacement. Araknae Quad Accelerators (20 WP, Anti-Armor ×1.3) provide AT fire against enemy vehicles, walkers, and titans. Useful through mid-game; late-game needs stationed anti-armor units to supplement. Mechanicum factions extend the cap to L20 (steep cost ramp past L10).

Crusade Volunteers (10 WP, 12 shield, 50 hull). Ground layer only. Cannot be dispatched. Targets infantry and light units — bounces off armored vehicles.

Ground-to-air anti-aircraft emplacement. Daedalus Stormcannons (15 WP, Anti-Air ×1.5) provide AA cover during the ground phase. Useful through mid-game; late-game needs stationed air support to supplement. Mechanicum factions extend the cap to L20 (steep cost ramp past L10).

Reinforced orbital fortress: +6 Defense Batteries per level + 200 void shield per level. Void layer only. Requires Void Fortress (4.9.2a). Targets escorts, cruisers, and capitals; rapid fire vs cruisers.

Bunker Crew (2 WP, 40 shield, 200 hull) — ground layer HP sponge. Adds hull to a shared HP pool across all garrison. WP too low to damage any unit reliably. Each level adds more crew and HP.

Defense Batteries (25 WP, 80 shield, 120 hull) — void layer only. Targets all void ships: prioritises fighters, gunships, and transports; also engages escorts, cruisers, and capital ships. Rapid fire bonus vs fighters and bombers. Each level adds more batteries.

Defense Cannons (70 WP) + orbital bombardment resistance (max 75%). Void layer. Targets escorts, cruisers, and capitals only — cannot target fighters, gunships, or transports. Rapid fire vs capitals. Cannot be targeted by void ships — ground assault only.

Planetary Cannons (70 WP, 40 shield, 60 hull) — void layer. Heavy anti-ship: targets escorts, cruisers, and capital ships only. Too slow to target fighters, gunships, or transports. Rapid fire bonus vs cruisers and capitals. Cannot be targeted by void ships — ground assault only.

PDF Regiments (6 WP, 10 shield, 40 hull each). Ground layer only. Cannot be dispatched. Targets infantry only — WP too low to damage armored units or vehicles.

Unique (max 1): +8 Defense Batteries and +400 void shield at level 1. Void layer only. Same targeting as Orbital Defense Platform — anti-air, cannot target armored ground units.

Planetary shield generators. Adds a shared shield pool split equally across all garrison units (Defense Batteries, Bunkers, PDF, Crusade Volunteers) in both void and ground combat phases. Only applies to garrison units, not your stationed fleet. Fewer garrison units means more shield per unit.

Command center for planetwide defensive architecture. Unlocks Legion elite units. Gains +1 recruit slot when your homeworld Legion Command reaches level 3, and +1 more at level 5.

Doctrine-dependent homeworld building. Effects change based on your active doctrine. Bulwark Mode: Generates a support fleet pool (void + ground WP) that regenerates over 24h. Pledge support units to allied Rallies without using your core fleet. Pool capacity + number of support fleets scale with level (1 fleet per level). Bulwark replenishment parallelism (per support fleet, per restock category — Infantry / Vehicles / Void Ships): • L1: 1 unit type rebuilding at a time per category (3 concurrent rebuilds) • L2-L3: 2 per category (6 concurrent) • L4+: 3 per category (9 concurrent) — fully-loaded recovery Vanguard Mode passive buffs by level (cumulative): • L1: +5% Salvage Recovery, +5 Starting Compliance • L2: +15% Fleet Travel Speed • L3: -10% Insertion Losses (applies in every drop; wave-loss cap 10% → 9%), -5% Recruit Cost • L4: +20% Bombardment Efficiency • L5: +10% Recruit Speed, Recruit Cost reduction upgraded to -10%

Mass-scale food cathedrum sustaining frontline morale. Projects +5%/level compliance growth to all friendly planets in the same sector and +2%/level to the 6 adjacent sectors. Agri Worlds only — one per planet. Max level 3.

+3% garrison combat bonus per level. Required for Dreadnoughts and capital ships. Homeworld-only — but bonuses project galaxy-wide. Level unlocks: • L1: Iterator Cadre • L2: Librarian • L2–L5: +1 Company Command Leadership Slot per level (4 total at L5) • L3: +1 recruit slot to your legion-unique production building on every world that has it (galaxy-wide) • L5: +1 more recruit slot to that legion-unique building (galaxy-wide) Homeworld supply-route emitter: each level extends the base supply effect by +1 hex (max 5 hexes at L5), reaching all friendly planets within that radius. No amount buff — just the standard +5%/tick supply contributor. Multiple players' Legion Commands stack additively across the sector chain.

Level 1 only (+5% all production). Grants +10% HP and +10% WP to garrison units. Projects +3%/tick compliance to all player planets in the same sector and +1%/tick to adjacent sectors. Requires 80% compliance. Destroyed if planet is conquered.

Recreation arcology where war-weary legions rotate through. Projects +5%/level compliance growth to all friendly planets in the same sector and +2%/level to the 6 adjacent sectors. Ocean Worlds only — one per planet. Max level 3.

Each level halves all building construction time on this planet (×0.5 per level). Parallel build slots unlock at L1, L3, and L5 (max 4 slots — extra levels past L5 only contribute the build-time cut, no more slots). Late levels (L6–L10) compound the time reduction further — at L10 a Mechanicum forge world can run effectively-instant construction.

Astartes armoury and weapon-smithy — higher levels unlock crafting of rarer Captain equipment. For Mechanicum, additionally hosts the Vehicle Pattern System: L2 unlocks Chimera (Light) and Rhino chassis, L3 unlocks Chimera (Siege), Leman Russ, and Sentinel chassis. Mech extends past L5 (up to L10) for additional pattern-recruit slots. Each level adds 3 recruit slots (Mech only — Astartes craft via the Forge but don't recruit units there).