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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