Frost Beard's Mug

Obtainment Method
After collecting Frozen Somethings, you may go to a lit furnace in the Furnace Room in Shiverchill Mountains to trade them in for Ice Crystals. Then, you go to the Miner (who looks like a merchant) in Ruined Entrance to trade 100 of the Ice Crystals for the Frost Beard's Mug

Perfect Pairing
Frost Beard's Clasp

Frozen Shard

Glacier Ward