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Warm Bottle is a magic vessel that acts as a thermus and heater.


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.[1] It did not hold nearly enough liquid for eight occupants.[2]


  • Renner possesses one and it is considered to be part of her prized possessions.


  1. Overlord Volume 05 Chapter 2: Blue Roses
  2. Overlord Volume 14 Chapter 4: Well-Prepared Traps
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