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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
- 11m 23s
- 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 11m 23s 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 |
|---|---|---|---|---|---|
| 1 | +1.2% | 86 | 40s | 3,000 | 50 |
| 2 | +2.4% | 172 | 1m | 4,200 | 70 |
| 3 | +3.6% | 258 | 1m 30s | 5,880 | 98 |
| 4 | +4.8% | 344 | 2m 15s | 8,220 | 137 |
| 5 | +6% | 430 | 3m 23s | 11,520 | 192 |
| 8 | +9.6% | 688 | 11m 23s | 31,620 | 527 |
Taken from nothing to level 8 that is 32m 51s of raw study and 103,140 of each of food, wood, stone and iron — 412,560 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. Nothing further in the tree depends on it, so it is a leaf: worth taking for its own bonus, never as a stepping stone.
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 | 13,080 | 12m 40s |
| Armor | 8 | 103,140 | 2h 11m |
| Fortification | 5 | 32,820 | 35m 10s |
| Stonework | 5 | 32,820 | 6m 36s |
| Battlements | 5 | 32,820 | 7m 42s |
| Portcullis | 5 | 32,820 | 7m 42s |
| Curtain Walls | 5 | 32,820 | 7m 42s |
| Total before you may begin | — | 280,320 | 3h 28m |
Related
Guide: Research & the Academy · Research Priorities. Studied at the Maester's Academy. Index: all 66 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
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.