What does Duelist do in AoE3?

Ships 1 Explorer's Dog; Hero: damage +50%, hit points +50%. The game says: "Improves your Swedish Explorer in combat, gives him a powerful Heavy Strike attack and a canine companion."

Home City card

Duelist

Duelist (tech ID DEHCExplorerSwedish) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Discovery Age. Effect: Ships 1 Explorer's Dog; Hero: damage +50%, hit points +50%.

Quick answers (3)

Which civilizations have the Duelist card?: Swedes.
What does Duelist do in AoE3?: Ships 1 Explorer's Dog; Hero: damage +50%, hit points +50%. The game says: "Improves your Swedish Explorer in combat, gives him a powerful Heavy Strike attack and a canine companion."
What is the tech ID of Duelist?: DEHCExplorerSwedish.

Improves your Swedish Explorer in combat, gives him a powerful Heavy Strike attack and a canine companion.

What it does

Ships 1 Explorer's Dog(unit)
Hero: damage +50%, hit points +50%

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

What it hands over

1 × Explorer's Dogno train cost

Total ≈ 0 resources — units at their train cost, crates and animals at what they hold.

Cost: 1
Sent from: I
Times it can be sent: 1
Game ID: DEHCExplorerSwedish

In these decks

SwedesI×1

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