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Base Building and Economy

A strong economy wins matches in Halo Wars: Definitive Edition. You cannot build units without supplies. You cannot unlock advanced units without tech levels. Managing your base slots efficiently is the most important skill to learn.

The Slot System​

Unlike traditional RTS games, you do not place buildings freely on the map. You claim a base location. That location provides a set number of building slots. A standard main base has seven slots. Mini-bases have fewer.

Every decision is a trade-off. If you build five Supply Pads, you have an incredible economy but no room for unit production buildings. If you build three unit production buildings, your economy will suffer.

Gathering Supplies​

Supplies are the only currency in the game. You spend supplies to build structures, train units, research upgrades, and use Leader Powers.

Supply Pads and Warehouses​

The UNSC builds Supply Pads. The Covenant builds Warehouses. These structures generate supplies over time.

Always build Supply Pads on your first few empty slots. The standard opening for almost every strategy is to build two or three Supply Pads immediately.

Upgrade your supply buildings as soon as possible. Heavy Supply Pads and Blessed Warehouses generate supplies significantly faster. Sergeant Forge gets Heavy Supply Pads by default. This makes him the strongest economic Leader in the game.

Map Resources​

You can find supply crates scattered across the map. Send your starting scout unit (a Warthog or Ghost) to collect these immediately. These crates give you a crucial early game boost.

Managing Tech Levels​

Tech levels lock your advanced units and upgrades. You start at Tech Level 1.

UNSC Tech​

The UNSC builds Reactors. Each Reactor increases your tech level by one.

  • Tech 1: One Reactor. Unlocks basic upgrades and early vehicles.
  • Tech 2: Two Reactors. Unlocks advanced units like Scorpions and Hornets.
  • Tech 3: Three Reactors. Unlocks the best units and final upgrades.
  • Tech 4: Four Tech Levels total. The maximum tech level does not require four separate base slots. By upgrading a Reactor to an Advanced Reactor (which provides two tech levels), you can reach Tech Level 4 using only two base slots.

Reactors take up valuable base slots. If you build three standard Reactors, you sacrifice economy or production space. You can upgrade a single Reactor to an Advanced Reactor for 1200 resources. This provides two tech levels from a single base slot. It is expensive but saves space.

Covenant Tech​

The Covenant operates on a fundamentally different spatial logic. Instead of building multiple Reactors, the Covenant builds a single Temple to unlock all tech tiers. This saves base slots, allowing Covenant bases to field more Warehouses. However, if the enemy destroys your Temple, you instantly lose all tech progression until you rebuild it. Protect your Temple at all costs using Shield Generators.

You also upgrade the Covenant base structure itself to unlock more building slots. The base escalation goes from Outpost (3 slots) to Keep (5 slots) and finally to Citadel (7 slots). You pay supplies to upgrade the base tier.

Securing Expansions​

One base is never enough for a long game. You need expansions. Look for empty base plots on the map. Clear out any neutral Rebel or Sentinel forces guarding them. Build a new base to double your supply generation.

If your opponent gets a second base and you do not, you will lose a war of attrition. They will simply out-produce you. Always scout for expansion opportunities and deny your opponent their expansions.