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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
- 9m 58s
- 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 9m 58s 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 |
|---|---|---|---|---|---|
| 1 | +1.2% | 82 | 35s | 3,000 | 50 |
| 2 | +2.4% | 164 | 53s | 4,200 | 70 |
| 3 | +3.6% | 246 | 1m 19s | 5,880 | 98 |
| 4 | +4.8% | 328 | 1m 58s | 8,220 | 137 |
| 5 | +6% | 410 | 2m 57s | 11,520 | 192 |
| 8 | +9.6% | 656 | 9m 58s | 31,620 | 527 |
Taken from nothing to level 8 that is 28m 45s 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
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. 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 → 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 | 13,080 | 12m 40s |
| Armor | 8 | 103,140 | 2h 11m |
| Fortification | 5 | 32,820 | 35m 10s |
| Siege Craft | 5 | 32,820 | 37m 23s |
| Murder Holes | 5 | 32,820 | 7m 42s |
| Total before you may begin | — | 214,680 | 3h 44m |
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 · Gatehouses · Counter-Siege · Murder Holes · 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.