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Research · Defense
Fortification
Raises troop defense — a deeper study of the wall than Armor alone.
- Entity ID
fortification- Branch
- Defense
- Stat buffed
defense— Defense- Bonus per level
- +2%
- Maximum level
- 10
- Bonus at maximum level
- +20%
- Power per level
- 85
- Power at maximum level
- 850
- Base study time
- 160 seconds
- Study time at maximum level
- 1h 48m
- Prerequisites
- Armor at level 8
Cost, time and bonus at every level
Fortification runs to level 10, adding +2% to defense and 85 power each time. Studying it out costs the four soft resources — the same amount of each — and takes 1h 48m 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 | +2% | 85 | 10m 13s | 12,000 | 11 |
| 2 | +4% | 170 | 13m 17s | 15,600 | 14 |
| 3 | +6% | 255 | 17m 17s | 20,280 | 18 |
| 4 | +8% | 340 | 22m 27s | 26,364 | 23 |
| 5 | +10% | 425 | 29m 12s | 34,273 | 30 |
| 10 | +20% | 850 | 1h 48m | 127,254 | 109 |
Taken from nothing to level 10 that is 7h 15m of raw study and 511,434 of each of food, wood, stone and iron — 2,045,736 resources in total.
Where it sits in the tree
Fortification belongs to the Defense branch — the walls line — what an attacker has to get through before they reach your granary. It stays locked until Armor reaches level 8. Studying it opens 4 further techs.
| Tech | Branch | Requires this tech at level |
|---|---|---|
| Siege Craft | Defense | 5 |
| Palisades | Defense | 3 |
| Stonework | Defense | 5 |
| Watchtowers | Defense | 8 |
The road here: Weaponry to level 3 → Armor to level 8 → Fortification. That is 2 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 |
| Total before you may begin | — | 334,172 | 4h 44m |
What it eventually opens: 18 studies sit downstream of Fortification, counting every remove.
| Study | Steps out | Buffs | At its cap | Study time at cap |
|---|---|---|---|---|
| Palisades | 1 | defense | +12% | 28m 37s |
| Siege Craft | 1 | attack | +15% | 1h 55m |
| Stonework | 1 | defense | +14.4% | 34m 21s |
| Watchtowers | 1 | defense | +12% | 20m 20s |
| Barbicans | 2 | defense | +9.6% | 14m 2s |
| Battlements | 2 | defense | +12% | 23m 43s |
| Counter-Siege | 2 | defense | +12% | 23m 43s |
| Moat Works | 2 | defense | +12% | 23m 43s |
| Murder Holes | 2 | attack | +12% | 23m 43s |
| Siege Engineering | 2 | attack | +9.6% | 14m 2s |
| Arrow Slits | 3 | attack | +9.6% | 14m 2s |
| Bombardment Doctrine | 3 | attack | +7.2% | 13m 46s |
| Concentric Castles | 3 | defense | +7.2% | 13m 3s |
| Deep Cisterns | 3 | defense | +7.2% | 13m 3s |
| Portcullis | 3 | defense | +12% | 23m 43s |
| Curtain Walls | 4 | defense | +9.6% | 14m 2s |
| The Long Memory | 4 | production_rate | +6% | 10m 57s |
| Gatehouses | 5 | defense | +9.6% | 16m 2s |
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: Siege Craft · Palisades · Stonework · Watchtowers · Moat Works · Battlements · Portcullis · Curtain Walls · Barbicans · Gatehouses · 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.