How do you get Ark of the Covenant with the console?

effect create_artifact_sculpture_ark_of_covenant_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 Ark of the Covenant?

They get Court grandeur baseline +6, Monthly Renown +5% instead.

Court artifact · Furniture

Ark of the Covenant

IllustriousUniqueHoly relic

Ark of the Covenant is an illustrious furniture artifact in Crusader Kings III: Court grandeur baseline +6, Domain Taxes (Same Faith) +15%, Clergy Opinion +10, Same heritage county advantage +5, Monthly Renown +5%, Piety +2/month. Quality 100 and wealth 100; maximum durability 150, and it does not wear out. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (3)

What does Ark of the Covenant do in CK3?: Court grandeur baseline +6, Domain Taxes (Same Faith) +15%, Clergy Opinion +10, Same heritage county advantage +5, Monthly Renown +5%, Piety +2/month (patch 1.20.0.3).
How do you get Ark of the Covenant with the console?: effect create_artifact_sculpture_ark_of_covenant_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 Ark of the Covenant?: They get Court grandeur baseline +6, Monthly Renown +5% instead.

A large stone chest said to be the original Ark of the Covenant, containing the stone tablets given to Moses by God.

Effects

For an owner who can't benefit from it

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

Who can benefit (can_benefit) (5 lines of game script)

OR = {
	jewish_artifact_access_trigger = yes
	christian_artifact_access_trigger = yes
	islamic_artifact_access_trigger = yes
}

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

Counts as a holy relic for (is_holy_relic) (14 lines of game script)

OR = {
	religion = religion:judaism_religion
	religion = religion:christianity_religion
	religion = religion:islam_religion
	main_rite = {
		rite_has_parameter = jewish_syncretic_actor
	}
	main_rite = {
		rite_has_parameter = christian_syncretic_actor
	}
	main_rite = {
		rite_has_parameter = islamic_syncretic_actor
	}
}

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

History and who has it

Made before recorded history.

How it is made

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

effect create_artifact_sculpture_ark_of_covenant_effect = { OWNER = root }

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

Source: game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt, common/modifiers (ark_of_covenant_modifier), common/artifacts/templates (ark_covenant_template) and the English localisation, Crusader Kings III 1.20.0.3.