What does Holy Rock do in CK3?

Piety +0.4/month (patch 1.20.0.3).

How do you get Holy Rock with the console?

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

Court artifact · Pedestal Item

Holy Rock

Rarity rolled when it is madeThe Royal Court

Holy Rock is a pedestal item artifact in Crusader Kings III: Piety +0.4/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 (2)

What does Holy Rock do in CK3?: Piety +0.4/month (patch 1.20.0.3).
How do you get Holy Rock with the console?: effect create_artifact_pedestal_rock_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

An uncommon rock that, according to tradition, fell from the sky and is considered sacred by the ….

Effects

Piety+0.4/month

How it is made

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

effect create_artifact_pedestal_rock_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_4_modifier) and the English localisation, Crusader Kings III 1.20.0.3.