How much does War Drums cost in AoE3?

400 coin, 10 seconds (AoE3: Definitive Edition 100.19.18309).

What does War Drums do in AoE3?

Cetan Bowman: train time −33%; Club Warrior: train time −33%; Wakina Rifleman: train time −25%. The game says: "The War Arrow! War Hut units train much more quickly."

Technology

War Drums

War Drums (tech ID BigWarHutWarDrums) is a technology in AoE3: Definitive Edition 100.19.18309 costing 400 coin, 10 s to research at the War Hut. Effect: Cetan Bowman: train time −33%; Club Warrior: train time −33%; Wakina Rifleman: train time −25%.

Quick answers (3)

How much does War Drums cost in AoE3?: 400 coin, 10 seconds (AoE3: Definitive Edition 100.19.18309).
What does War Drums do in AoE3?: Cetan Bowman: train time −33%; Club Warrior: train time −33%; Wakina Rifleman: train time −25%. The game says: "The War Arrow! War Hut units train much more quickly."
What is the tech ID of War Drums?: BigWarHutWarDrums.

The War Arrow! War Hut units train much more quickly.

What it does

Cetan Bowman: train time −33%
Club Warrior: train time −33%
Wakina Rifleman: train time −25%

Cost: 400
Research time: 10 s
Game ID: BigWarHutWarDrums

Researched at

War Hut

Civilizations

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).