Kitsune-tsuki

Kitsune-tsuki, or fox possession, is a ritual in which a Kitsune summons a more powerful kitsune to Possess them, granting them the power they need to fulfill their goals.

However, this is risky, as the summoned kitsune will have their own agenda, and may not co-operate with their host.

They may also chose to possess someone other than the kitsune who summoned them.