What does Statue of Mary do in CK3?

Piety +0.3/month (patch 1.20.0.3).

How do you get Statue of Mary with the console?

effect create_artifact_sculpture_religious_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

What if the owner can't benefit from Statue of Mary?

They get Court grandeur baseline +3 instead.

Court artifact · Furniture

Statue of Mary

Rarity rolled when it is madeHoly relicThe Royal Court

Statue of Mary is a furniture artifact in Crusader Kings III: Piety +0.3/month. It needs The Royal Court. Patch 1.20.0.3, from game/common/scripted_effects/01_ep1_court_artifact_creation_effects.txt.

Quick answers (3)

What does Statue of Mary do in CK3?: Piety +0.3/month (patch 1.20.0.3).
How do you get Statue of Mary with the console?: effect create_artifact_sculpture_religious_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).
What if the owner can't benefit from Statue of Mary?: They get Court grandeur baseline +3 instead.

A carved and painted statue of the Mother of God. The base is inscribed with a quote from the … ….

Effects

Piety+0.3/month

Also gets random bonuses when it is made, from add_scaled_artifact_modifier_piety_effect, add_scaled_artifact_modifier_devotion_effect, add_scaled_artifact_modifier_grandeur_small_effect — the bigger ones at higher rarity.

For an owner who can't benefit from it

The template gives these instead of the effects above when its “can benefit” check fails:

Court grandeur baseline+3

Who can benefit (can_benefit) (4 lines of game script)

scope:artifact = {
	has_variable = statue_religion
}
religion = scope:artifact.var:statue_religion

As written in game/common/artifacts/templates (religious_statue_template).

Counts as a holy relic for (is_holy_relic) (4 lines of game script)

scope:artifact = {
	has_variable = statue_religion
}
religion = scope:artifact.var:statue_religion

As written in game/common/artifacts/templates (religious_statue_template).

How it is made

The game creates it with the scripted effect create_artifact_sculpture_religious_effect. In the console (how to open it), this gives it to the character you play:

effect create_artifact_sculpture_religious_effect = { OWNER = root }

Built from the effect's file; not run in the game by us.

Source: game/common/scripted_effects/01_ep1_court_artifact_creation_effects.txt, common/modifiers (artifact_monthly_piety_3_modifier), common/artifacts/templates (religious_statue_template) and the English localisation, Crusader Kings III 1.20.0.3.