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Coldbrim Hat
Coldbrim Hat
Uncommon
Coldbrim Chill: Once per turn, any condition inflicted on a target, also applies 2 turns of Encrusted with Frost.
Upturning the hat and gazing into it, you get this slightly vertiginous feeling, as if you were looking into a cold, abandoned well with no discernible end.
Location - Coldbrim Hat
Located in the 
Moonrise Towers First Floor. You will have to gain access to Balthazaar's secret room. On the Balthazar's Bookshelf interact with"Bookshelf Labelled 'Musty Tomes'" and an ancient altar will appear. You can insert a heart that a dead Balthazaar's Apprentice carries nearby.
The hat will be inside a locked Opulent Chest.
Discussion
Moonrise Towers X: -155 Y: -173: Found in a locked chest in a hidden room behind a bookcase in Balthazar's Chambers.
Sorcerous Sundries: Found on a table by the Lava Elemental.
Act Two:
Found in a locked chest in a hidden room behind a bookcase in Balthazar's Chambers within Moonrise Towers.
Act Three:
Found on a table by the Lava Elemental in Sorcerous Sundries.