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Research · Defense
Gatehouses
A fortress within the fortress, at the weakest point — raises troop defense further.
- Entity ID
gatehouses- Branch
- Defense
- Stat buffed
defense— Defense- Bonus per level
- +1.2%
- Maximum level
- 8
- Bonus at maximum level
- +9.6%
- Power per level
- 86
- Power at maximum level
- 688
- Base study time
- 40 seconds
- Study time at maximum level
- 16m 2s
- Prerequisites
- Curtain Walls at level 5
Cost, time and bonus at every level
Gatehouses runs to level 8, adding +1.2% to defense and 86 power each time. Studying it out costs the four soft resources — the same amount of each — and takes 16m 2s for the final level alone. Gems are only ever the optional instant finish; the study itself is bought with what your fields already make.
| Level | Total defense | Power | Study time | Each resource | Gems to finish instantly |
|---|---|---|---|---|---|
| 1 | +1.2% | 86 | 2m 33s | 12,000 | 3 |
| 2 | +2.4% | 172 | 3m 19s | 15,600 | 4 |
| 3 | +3.6% | 258 | 4m 19s | 20,280 | 5 |
| 4 | +4.8% | 344 | 5m 37s | 26,364 | 6 |
| 5 | +6% | 430 | 7m 18s | 34,273 | 8 |
| 8 | +9.6% | 688 | 16m 2s | 75,298 | 17 |
Taken from nothing to level 8 that is 1h of raw study and 286,292 of each of food, wood, stone and iron — 1,145,168 resources in total.
Where it sits in the tree
Gatehouses belongs to the Defense branch — the walls line — what an attacker has to get through before they reach your granary. It stays locked until Curtain Walls reaches level 5. Studying it opens 1 further tech.
| Tech | Branch | Requires this tech at level |
|---|---|---|
| Concentric Castles | Defense | 5 |
The road here: Weaponry to level 3 → Armor to level 8 → Fortification to level 5 → Stonework to level 5 → Battlements to level 5 → Portcullis to level 5 → Curtain Walls to level 5 → Gatehouses. That is 7 studies standing between a fresh Academy and this one.
| Prerequisite | Level required | Each resource | Study time |
|---|---|---|---|
| Weaponry | 3 | 47,880 | 40m 47s |
| Armor | 8 | 286,292 | 4h 3m |
| Fortification | 5 | 108,517 | 1h 32m |
| Stonework | 5 | 108,517 | 17m 20s |
| Battlements | 5 | 108,517 | 20m 13s |
| Portcullis | 5 | 108,517 | 20m 13s |
| Curtain Walls | 5 | 108,517 | 20m 13s |
| Total before you may begin | — | 876,757 | 7h 35m |
What it eventually opens: 2 studies sit downstream of Gatehouses, counting every remove.
| Study | Steps out | Buffs | At its cap | Study time at cap |
|---|---|---|---|---|
| Concentric Castles | 1 | defense | +7.2% | 13m 3s |
| The Long Memory | 2 | production_rate | +6% | 10m 57s |
Related
Guide: Research & the Academy · Research Priorities. Studied at the Maester's Academy. Index: all 81 studies · the whole database.
Rest of the Defense branch: Fortification · Siege Craft · Palisades · Stonework · Watchtowers · Moat Works · Battlements · Portcullis · Curtain Walls · Barbicans · Counter-Siege · Murder Holes · Arrow Slits · Siege Engineering · Concentric Castles · Deep Cisterns · Bombardment Doctrine
Every figure above is generated from the shipped game code — the same constants and formulas the running game uses — and regenerated whenever the balance changes. Nothing on this page is hand-typed.