What does Imperator do in AoE3?

Ships 1 Battleship; Battleship: hit points −20%, damage +20%. The game says: "Ships a mighty Battleship! Russian Battleships inflict more damage and are cheaper, but now have less hitpoints."

Home City card

Imperator

Imperator (tech ID DEHCRussianBattleshipCard) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Ships 1 Battleship; Battleship: hit points −20%, damage +20%. It hands over about 2,000 resources' worth.

Quick answers (3)

Which civilizations have the Imperator card?: Russians.
What does Imperator do in AoE3?: Ships 1 Battleship; Battleship: hit points −20%, damage +20%. The game says: "Ships a mighty Battleship! Russian Battleships inflict more damage and are cheaper, but now have less hitpoints."
What is the tech ID of Imperator?: DEHCRussianBattleshipCard.

Ships a mighty Battleship! Russian Battleships inflict more damage and are cheaper, but now have less hitpoints.

What it does

Ships 1 Battleship(unit)
Battleship: hit points −20%, damage +20%

1 further effect (interface, visuals or AI) not listed.

What it hands over

1 × Battleship2,000 each

Total ≈ 2,000 resources — units at their train cost, crates and animals at what they hold.

Cost: 1,0001
Sent from: IV
Times it can be sent: 1
Game ID: DEHCRussianBattleshipCard

In these decks

RussiansIV×1

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