How do you get Mantle of the Prophet with the console?

effect create_artifact_mantle_of_the_prophet_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 Mantle of the Prophet?

They get Court grandeur baseline +3 instead.

Personal artifact · Regalia

Mantle of the Prophet

IllustriousUniqueHoly relic

Mantle of the Prophet is an illustrious regalia artifact in Crusader Kings III: Domain Taxes (Same Faith) +10%, Monthly Piety +25%, Prestige +0.25/month, Monthly Renown +5%. Quality 100 and wealth 100; maximum durability 150, and it does not wear out. At game start it goes to the holder of Sunni Caliphate. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (3)

What does Mantle of the Prophet do in CK3?: Domain Taxes (Same Faith) +10%, Monthly Piety +25%, Prestige +0.25/month, Monthly Renown +5% (patch 1.20.0.3).
How do you get Mantle of the Prophet with the console?: effect create_artifact_mantle_of_the_prophet_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 Mantle of the Prophet?: They get Court grandeur baseline +3 instead.

Inherited for centuries from one Caliph to the next, this is the mantle of the Prophet. It is traditionally worn by the Caliph during all festive holidays, giving him an air of overpowering tranquility and dignity.

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:

Court grandeur baseline+3

Who can benefit (can_benefit) (1 line of game script)

islamic_artifact_access_trigger = yes

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

Counts as a holy relic for (is_holy_relic) (6 lines of game script)

OR = {
	religion = religion:islam_religion
	main_rite = {
		rite_has_parameter = islamic_syncretic_actor
	}
}

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

History and who has it

Made before recorded history.
At game start: the holder of Sunni Caliphate.

How it is made

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

effect create_artifact_mantle_of_the_prophet_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 (mantle_prophet_modifier), common/artifacts/templates (islam_artifact_template) and the English localisation, Crusader Kings III 1.20.0.3.