Huskyboost.com - Patch 7.2.5 introduces the ability to upgrade your previous heirlooms to level 110. You can buy Weathered Heirloom Armor Casing or Weathered Heirloom Scabbard from Estelle Gendry in the Undercity
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Anyone else hear about heirloom upgrades? | XPOff
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Battle-Hardened Heirloom upgrades boost heirlooms to 120 in Patch 8.1.5, but they aren't cheap
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New heirlooms (and other items) already at Guild Vendor!!
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Blizz, when you finalized the Int leather heirloom legs, were you out of browns, maybe? : r/wow
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World Of Warcraft Heirloom Leveling Gear To Undergo Complete Rehaul With Today's Prepatch