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Research · Defense
Portcullis
Iron teeth over the gate — raises troop defense.
- Entity ID
portcullis- Branch
- Defense
- Stat buffed
defense— Defense- Bonus per level
- +1.2%
- Maximum level
- 10
- Bonus at maximum level
- +12%
- Power per level
- 78
- Power at maximum level
- 780
- Base study time
- 35 seconds
- Study time at maximum level
- 23m 43s
- Prerequisites
- Battlements at level 5
Cost, time and bonus at every level
Portcullis runs to level 10, adding +1.2% to defense and 78 power each time. Studying it out costs the four soft resources — the same amount of each — and takes 23m 43s 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% | 78 | 2m 14s | 12,000 | 3 |
| 2 | +2.4% | 156 | 2m 54s | 15,600 | 3 |
| 3 | +3.6% | 234 | 3m 47s | 20,280 | 4 |
| 4 | +4.8% | 312 | 4m 55s | 26,364 | 5 |
| 5 | +6% | 390 | 6m 23s | 34,273 | 7 |
| 10 | +12% | 780 | 23m 43s | 127,254 | 24 |
Taken from nothing to level 10 that is 1h 35m 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
Portcullis belongs to the Defense branch — the walls line — what an attacker has to get through before they reach your granary. It stays locked until Battlements reaches level 5. Studying it opens 1 further tech.
| Tech | Branch | Requires this tech at level |
|---|---|---|
| Curtain Walls | 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. That is 5 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 |
| Total before you may begin | — | 659,723 | 6h 54m |
What it eventually opens: 4 studies sit downstream of Portcullis, counting every remove.
| Study | Steps out | Buffs | At its cap | Study time at cap |
|---|---|---|---|---|
| Curtain Walls | 1 | defense | +9.6% | 14m 2s |
| Gatehouses | 2 | defense | +9.6% | 16m 2s |
| Concentric Castles | 3 | defense | +7.2% | 13m 3s |
| The Long Memory | 4 | 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 · 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.