What does Jeweled Slippers do in CK3?

Prestige +0.08/month (patch 1.20.0.3).

What if the owner can't benefit from Jeweled Slippers?

They get Prestige +0.05/month, Stress Gain -10%, Monthly Piety -5% instead.

Personal artifact · Trinket

Jeweled Slippers

Masterwork

Jeweled Slippers is a masterwork trinket artifact in Crusader Kings III: Prestige +0.08/month. Quality 30 and wealth 30; maximum durability 75. Patch 1.20.0.3, from game/events/travel_events/travel_events_james.txt.

Quick answers (2)

What does Jeweled Slippers do in CK3?: Prestige +0.08/month (patch 1.20.0.3).
What if the owner can't benefit from Jeweled Slippers?: They get Prestige +0.05/month, Stress Gain -10%, Monthly Piety -5% instead.

A beautiful pair of jewel-encrusted slippers. Something about wearing them makes you feel like you can always find your way home.

Effects

Prestige+0.08/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:

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

is_witch_trigger = yes

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

How it is made

Made only inside events; no scripted effect to call from the console.

Also created in event travel_events.4034.

Source: game/events/travel_events/travel_events_james.txt, common/modifiers (artifact_monthly_prestige_2_modifier), common/artifacts/templates (witchy_shoes_template) and the English localisation, Crusader Kings III 1.20.0.3.