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The Reins of the White Polar Bear is an item that can be used to summon a polar bear mount. The reins can very rarely be found inside Hyldnir Spoils. The estimated drop rate is ~1%. It can also be listed on the Black Market Auction House.
Here you can buy White Polar Bear for EU or US Servers.
You'll get guide for getting White Polar Bear
• You'll be able to get White Polar Bear
• After patch 10.2 might will need character transfer for access to BMAH