What does Siege Hitpoints do in AoE3?

Elite Mantlet: hit points +15%; Light Cannon: hit points +15%; Elite Ram: hit points +15%. The game says: "All Haudenosaunee Siege weapons get more hitpoints."

Home City card

Siege Hitpoints

Siege Hitpoints (tech ID HCXPSiegeHitpoints) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Fortress Age. Effect: Elite Mantlet: hit points +15%; Light Cannon: hit points +15%; Elite Ram: hit points +15%.

Quick answers (3)

Which civilizations have the Siege Hitpoints card?: Haudenosaunee.
What does Siege Hitpoints do in AoE3?: Elite Mantlet: hit points +15%; Light Cannon: hit points +15%; Elite Ram: hit points +15%. The game says: "All Haudenosaunee Siege weapons get more hitpoints."
What is the tech ID of Siege Hitpoints?: HCXPSiegeHitpoints.

All Haudenosaunee Siege weapons get more hitpoints.

What it does

Elite Mantlet: hit points +15%
Light Cannon: hit points +15%
Elite Ram: hit points +15%

Cost: 1
Sent from: III
Times it can be sent: 1
Game ID: HCXPSiegeHitpoints

In these decks

HaudenosauneeIII×1

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