AoE3 DatabaseAoE3: DE 100.19.18309 · read from the game files · unofficial

Technology

Guard Cossacks

Guard Cossacks (tech ID DEREVGuardCossacks) is a technology in AoE3: Definitive Edition 100.19.18309 costing 1,200 wood, 1,200 coin, 30 s to research at the Barracks and Stable. Effect: Serdyuk: damage +30%, hit points +30%; Haidamaka Rifleman: damage +30%, hit points +30%; Haidamaka: damage +30%, hit points +30%; Starshyna: damage +30%, hit points +30%.

Quick answers (3)
How much does Guard Cossacks cost in AoE3?
1,200 wood, 1,200 coin, 30 seconds (AoE3: Definitive Edition 100.19.18309).
What does Guard Cossacks do in AoE3?
Serdyuk: damage +30%, hit points +30%; Haidamaka Rifleman: damage +30%, hit points +30%; Haidamaka: damage +30%, hit points +30%; Starshyna: damage +30%, hit points +30%. The game says: "Increases attack and hitpoints of Haidamaka, Serdyuks and Starshyna."
What is the tech ID of Guard Cossacks?
DEREVGuardCossacks.

Increases attack and hitpoints of Haidamaka, Serdyuks and Starshyna.

What it does

Cost
Coin1,200Wood1,200
Research time
30 s
Game ID
DEREVGuardCossacks

Researched at

Civilizations

Poles

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