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Research · Military

Battle Drums

A cadence that steadies green recruits — raises training speed further still.

Entity ID
battle_drums
Branch
Military
Stat buffed
train_speed — Train speed
Bonus per level
+1.2%
Maximum level
10
Bonus at maximum level
+12%
Power per level
76
Power at maximum level
760
Base study time
35 seconds
Study time at maximum level
23m 43s
Prerequisites
Muster Rolls at level 8

Cost, time and bonus at every level

Battle Drums runs to level 10, adding +1.2% to train_speed and 76 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.

Battle Drums: what each level costs and what it grants.
LevelTotal train speedPowerStudy timeEach resourceGems to finish instantly
1+1.2%762m 14s12,0003
2+2.4%1522m 54s15,6003
3+3.6%2283m 47s20,2804
4+4.8%3044m 55s26,3645
5+6%3806m 23s34,2737
10+12%76023m 43s127,25424

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

Battle Drums belongs to the Military branch — the offence line — what your swords, horses and bows hit for. It stays locked until Muster Rolls reaches level 8. Studying it opens 1 further tech.

Techs gated behind Battle Drums.
TechBranchRequires this tech at level
The Standing ArmyMilitary5

The road here: Weaponry to level 3 → Armor to level 5 → Drilling to level 8 → Muster Rolls to level 8 → Battle Drums. That is 4 studies standing between a fresh Academy and this one.

What Battle Drums costs before its own first level: the prerequisite chain, at the levels it demands.
PrerequisiteLevel requiredEach resourceStudy time
Weaponry347,88040m 47s
Armor5108,5171h 32m
Drilling8286,2923h 48m
Muster Rolls8286,29245m 44s
Total before you may begin—728,9816h 47m

What it eventually opens: 1 study sits downstream of Battle Drums, counting every remove.

Everything gated behind Battle Drums, directly or at a remove.
StudySteps outBuffsAt its capStudy time at cap
The Standing Army1train_speed+7.2%13m 46s

Guide: Research & the Academy · Research Priorities. Studied at the Maester's Academy. Index: all 81 studies · the whole database.

Rest of the Military branch: Weaponry · Armor · Drilling · Swordsmanship · Archery · Marksmanship · Spearwork · Blacksmithing · Forged Steel · Shieldwork · Infantry Discipline · Tempering · Ironclad Mail · Horsemanship · Cavalry Tactics · Warhorses · Muster Rolls · Quartermastery · Baggage Trains · Supply Columns · Pattern Welding · The Unbroken Line · The Standing Army

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.

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