What does Mikazuki do in CK3?

Prowess +2, Prestige +0.2/month, Knight Effectiveness +10% (patch 1.20.0.3).

How do you get Mikazuki with the console?

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

Personal artifact · Weapon

Mikazuki

Masterwork

Mikazuki is a masterwork weapon artifact in Crusader Kings III: Prowess +2, Prestige +0.2/month, Knight Effectiveness +10%. Quality 30 and wealth 30; maximum durability 75, and it does not wear out. Made on 980.1.1 for Yoritada Ononomiya-ryū in Heian-kyō. At game start it goes to the holder of Kan'in Family and the holder of Ashikaga 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 Mikazuki do in CK3?: Prowess +2, Prestige +0.2/month, Knight Effectiveness +10% (patch 1.20.0.3).
How do you get Mikazuki with the console?: effect create_artifact_mikazuki_munechika_sword_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

The 'Crescent Moon' was forged by the famed smith Sanjō Munechika in the reign of Ichijō Ten'nō.

Effects

History and who has it

Made on 980.1.1 for Yoritada Ononomiya-ryū in Heian-kyō.
At game start: the holder of Kan'in Family.
At game start: the holder of Ashikaga Family (starts from 1178.10.1).

How it is made

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

effect create_artifact_mikazuki_munechika_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 (mikazuki_munechika_sword_modifier) and the English localisation, Crusader Kings III 1.20.0.3.