How do you get Staff of Kakusandha with the console?

effect create_artifact_staff_kakusandha_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 Staff of Kakusandha?

They get Court grandeur baseline +3 instead.

Court artifact · Pedestal Item

Staff of Kakusandha

IllustriousUniqueHoly relicThe Royal Court

Staff of Kakusandha is an illustrious pedestal item artifact in Crusader Kings III: Court grandeur baseline +2, Piety +0.3/month, Development Growth +10%, Clergy Opinion +10. Quality 100 and wealth 100; maximum durability 150, and it does not wear out. At game start it goes to the holder of Pagan — needs The Royal Court. It needs The Royal Court. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (3)

What does Staff of Kakusandha do in CK3?: Court grandeur baseline +2, Piety +0.3/month, Development Growth +10%, Clergy Opinion +10 (patch 1.20.0.3).
How do you get Staff of Kakusandha with the console?: effect create_artifact_staff_kakusandha_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 Staff of Kakusandha?: They get Court grandeur baseline +3 instead.

Kakusandha, the first Buddha of the present Kalpa, owned this staff both to ward off dangerous animals and scare away smaller ones, that they might not be trodden on by wandering monks.

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)

has_religion = religion:buddhism_religion

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

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

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

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

History and who has it

Made before recorded history.
At game start: the holder of Pagan — needs The Royal Court.

How it is made

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

effect create_artifact_staff_kakusandha_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 (kakusandha_modifier), common/artifacts/templates (buddhism_artifact_template) and the English localisation, Crusader Kings III 1.20.0.3.