How do you get Siddhachakra with the console?

effect create_artifact_siddhachakra_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 Siddhachakra?

They get Court grandeur baseline +3 instead.

Court artifact · Pedestal Item

Siddhachakra

MasterworkUniqueHoly relic

Siddhachakra is a masterwork pedestal item artifact in Crusader Kings III: Court grandeur baseline +2, Piety +0.3/month, Piety per Powerful Vassal on the Council +0.1/month. Quality 30 and wealth 30; maximum durability 75. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (3)

What does Siddhachakra do in CK3?: Court grandeur baseline +2, Piety +0.3/month, Piety per Powerful Vassal on the Council +0.1/month (patch 1.20.0.3).
How do you get Siddhachakra with the console?: effect create_artifact_siddhachakra_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 Siddhachakra?: They get Court grandeur baseline +3 instead.

This is a mystical diagram used for worship by Jains. At its center a blossomed lotus is surrounded by deities on petals, symbology connected with the legend of King Shripala and his wife Mayanasundari.

Effects

Court grandeur baseline+2
Piety+0.3/month
Piety per Powerful Vassal on the Council+0.1/month

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) (3 lines of game script)

jain_or_syncretic_with_eastern_trigger = {
	CHARACTER = root
}

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

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

OR = {
	religion = religion:jainism_religion
	main_rite = {
		rite_has_parameter = eastern_syncretic_actor
	}
}

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

History and who has it

Made before recorded history.

How it is made

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

effect create_artifact_siddhachakra_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 (siddhachakra_modifier), common/artifacts/templates (jainism_artifact_template) and the English localisation, Crusader Kings III 1.20.0.3.