To unlock T4 (Tier 4) troops in Game of Thrones: Winter is Coming, you must research the “Royal” variant of your chosen troop type under the Military research tree in the Maester’s Tower.

Unlocking T4 is a massive milestone that requires upgrading your primary castle infrastructure to Level 25 and maxing out a long line of prerequisite combat research. [1]

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Step 1: Maximize Your Main Infrastructure

Before you can even begin the final T4 research, your kingdom must hit specific building milestones to unlock the necessary technology levels.

• Upgrade Castle to Level 25: This is the ultimate requirement that unlocks Level 25 for all secondary structures.
• Upgrade Maester’s Tower to Level 25: You cannot access Level 10 research nodes without a maxed-out Tower.
• Upgrade Barracks to Level 25: Required to physically train the T4 troops once unlocked.

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Step 2: Clear the Military Research Tree

You must fully max out the Military tree in your Maester’s Tower. This means every single node leading down to the T4 troops must be at Level 10/10.

• Max out Core Stats: Upgrade Infantry/Cavalry/Spearmen/Bowmen Attack, Defense, and Health nodes to Level 10.
• Max out Army Stats: Upgrade Army Attack, Army Defense, and Army Health to Level 10.
• Max out Leadership: Complete the Marching Size and Training Speed nodes.

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Step 3: Research the Specific T4 Troop Node

Once all prerequisites are met, scroll to the very bottom of the Military tree. You must complete the 10-step research for the specific “Royal” troop type you want:

1. Royal Infantry (T4 Infantry)
2. Royal Cavalry (T4 Cavalry)
3. Royal Spearmen (T4 Spearmen)
4. Royal Bowmen (T4 Bowmen)

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Step 4: Gather the Required Resources

The final research step is incredibly expensive. You will need hundreds of millions of basic resources, plus specialized currency. Ensure you have stockpiled:

• Gold: T4 research requires an immense amount of Gold compared to lower tiers.
• Grain, Wood, Stone, and Iron: Ensure your warehouses are full or your bags contain enough resource tokens.
• Research Speed-ups: The base timer for a single T4 troop research node takes several months of real-world time without speed-ups and research gear. [1]

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✅ T4 Unlocked

Once the Royal [Troop Type] research bar hits 100%, you will successfully unlock your first Tier 4 troop type. You can then immediately begin training them in your Level 25 Barracks using resources and Gold.