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Research · Defense
Arrow Slits
A narrow window that only lets fire out — raises troop attack when breaking a wall further.
- Entity ID
arrow_slits- Branch
- Defense
- Stat buffed
attack— Attack- Bonus per level
- +1.2%
- Maximum level
- 8
- Bonus at maximum level
- +9.6%
- Power per level
- 82
- Power at maximum level
- 656
- Base study time
- 35 seconds
- Study time at maximum level
- 14m 2s
- Prerequisites
- Murder Holes at level 5
Cost, time and bonus at every level
Arrow Slits runs to level 8, adding +1.2% to attack and 82 power each time. Studying it out costs the four soft resources — the same amount of each — and takes 14m 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 attack | Power | Study time | Each resource | Gems to finish instantly |
|---|---|---|---|---|---|
| 1 | +1.2% | 82 | 2m 14s | 12,000 | 3 |
| 2 | +2.4% | 164 | 2m 54s | 15,600 | 3 |
| 3 | +3.6% | 246 | 3m 47s | 20,280 | 4 |
| 4 | +4.8% | 328 | 4m 55s | 26,364 | 5 |
| 5 | +6% | 410 | 6m 23s | 34,273 | 7 |
| 8 | +9.6% | 656 | 14m 2s | 75,298 | 15 |
Taken from nothing to level 8 that is 53m 21s 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
Arrow Slits belongs to the Defense branch — the walls line — what an attacker has to get through before they reach your granary. It stays locked until Murder Holes reaches level 5. Studying it opens 1 further tech.
| Tech | Branch | Requires this tech at level |
|---|---|---|
| Bombardment Doctrine | Defense | 5 |
The road here: Weaponry to level 3 → Armor to level 8 → Fortification to level 5 → Siege Craft to level 5 → Murder Holes to level 5 → Arrow Slits. 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 |
| Siege Craft | 5 | 108,517 | 1h 38m |
| Murder Holes | 5 | 108,517 | 20m 13s |
| Total before you may begin | — | 659,723 | 8h 15m |
What it eventually opens: 1 study sits downstream of Arrow Slits, counting every remove.
| Study | Steps out | Buffs | At its cap | Study time at cap |
|---|---|---|---|---|
| Bombardment Doctrine | 1 | attack | +7.2% | 13m 46s |
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 · Gatehouses · Counter-Siege · Murder Holes · 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.