What does Higekiri do in CK3?

Prowess +2, Prestige +0.2/month, Dread Decay -15% (patch 1.20.0.3).

How do you get Higekiri with the console?

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

Personal artifact · Weapon

Higekiri

Masterwork

Higekiri is a masterwork weapon artifact in Crusader Kings III: Prowess +2, Prestige +0.2/month, Dread Decay -15%. Quality 30 and wealth 30; maximum durability 75, and it does not wear out. Made on 950.1.1 for Mitsunaka Minamoto in Dazaifu. At game start it goes to the holder of Seiwa Family and the holder of Kawachi Family (starts from 1178.10.1). Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (2)

What does Higekiri do in CK3?: Prowess +2, Prestige +0.2/month, Dread Decay -15% (patch 1.20.0.3).
How do you get Higekiri with the console?: effect create_artifact_higekiri_sword_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

The 'Beard-cutter' was commissioned along with Hizamaru by Minamoto no Mitsunaka, and passed down the Seiwa Minamoto family.

Effects

Prowess+2
Prestige+0.2/month
Dread Decay-15%

History and who has it

Made on 950.1.1 for Mitsunaka Minamoto in Dazaifu.
Kept with the title Kawachi Family from 1021.1.1.
At game start: the holder of Seiwa Family.
At game start: the holder of Kawachi Family (starts from 1178.10.1).

How it is made

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

effect create_artifact_higekiri_sword_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 (higekiri_sword_modifier) and the English localisation, Crusader Kings III 1.20.0.3.