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

Technology

Legendary War Boats

Legendary War Boats (tech ID DELegendaryWarCanoes) is a technology in AoE3: Definitive Edition 100.19.18309 costing 1,000 wood, 1,000 coin, 30 s to research at the Dock and Port. Effect: War Canoe: hit points +25%, damage +25%; Tlaloc Canoe: hit points +25%, damage +25%; Chincha Raft: hit points +25%, damage +25%.

Quick answers (3)
How much does Legendary War Boats cost in AoE3?
1,000 wood, 1,000 coin, 30 seconds (AoE3: Definitive Edition 100.19.18309).
What does Legendary War Boats do in AoE3?
War Canoe: hit points +25%, damage +25%; Tlaloc Canoe: hit points +25%, damage +25%; Chincha Raft: hit points +25%, damage +25%. The game says: "Improves the damage and hitpoints of War Canoes, Tlaloc Canoes, and Chincha Rafts."
What is the tech ID of Legendary War Boats?
DELegendaryWarCanoes.

Improves the damage and hitpoints of War Canoes, Tlaloc Canoes, and Chincha Rafts.

What it does

Cost
Coin1,000Wood1,000
Research time
30 s
Game ID
DELegendaryWarCanoes

Researched at

Civilizations

IncaAztecsHaudenosauneeLakota

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