Which civilizations have the Peerage card?

Germans, Swedes, Maltese and Poles.

What does Peerage do in AoE3?

Hero: hit points +1,000, damage (Melee) +100%, damage (Ranged) +100%, damage (Musket) +100%. The game says: "Explorer attack and hitpoints greatly increased."

Home City card

Peerage

Peerage (tech ID DEHCREVPeerage) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 4 civilizations, sent from the Industrial Age. Effect: Hero: hit points +1,000, damage (Melee) +100%, damage (Ranged) +100%, damage (Musket) +100%.

Quick answers (3)

Which civilizations have the Peerage card?: Germans, Swedes, Maltese and Poles.
What does Peerage do in AoE3?: Hero: hit points +1,000, damage (Melee) +100%, damage (Ranged) +100%, damage (Musket) +100%. The game says: "Explorer attack and hitpoints greatly increased."
What is the tech ID of Peerage?: DEHCREVPeerage.

Explorer attack and hitpoints greatly increased.

What it does

Hero: hit points +1,000, damage (Melee) +100%, damage (Ranged) +100%, damage (Musket) +100%

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

In these decks

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