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Squad lanes, shared research and the OR gate that does not need three upgrades.
Read guideCastle, Barracks, Scholar Tower and Soldier X: the gates to check before T10.

Top Lords Guide
Your T10 unlock checklist
Four milestones. One full prerequisite path.
Castle 30
Finish the supporting building requirements.
Scholar Tower 30
Use an eligible Tower I or II branch.
Barracks 30
Prepare the T10 training building.
Soldier X
Complete its full research prerequisite path.
The research route crosses trees
01
Check completed research
Mark the levels you already have so the budget covers the upgrades still missing.
02
Include the earlier branches
Royal Guard is the destination. Required Alliance Duel / Super Reward research also belongs in the route.
03
Apply your actual bonuses
Speed changes the work rate. Resource reduction is a separate input.
04
Budget buildings and training too
The research-only subtotal excludes construction and the soldiers you will train.
+10% speed:
60 minutes ÷ 1.10 = about 54 minutes 33 seconds.
Top Lords reference; version and missing coverage follow the linked guide
Full guide & calculator on the website
toplordsguide.com
View full size Squad lanes, shared research and the OR gate that does not need three upgrades.
Read guide