Warm Bottle is a magic tool counterpart for home appliances. Princess Renner used it quite liberally when receiving a particularly important guest and rarely brought it out otherwise.
It appears like a regular teapot, the same type used for tea parties.
Warm Bottle has the effect of maintaining the temperature and quality of stored beverage for one hour.
- Renner possesses one and it is considered to be part of her prized possessions.