Wondrous Item, uncommon (requires attunement by a Requires a Barbarian or Fighter)
A necklace of blue crystal and bone that channels the wearer’s rage into icy, fearless power.
While attuned, the wearer can use a bonus action to enter a frigid rage for 1 minute (once per long rest). While in this state, all melee weapon attacks deal an extra 1d4 cold damage, and the wearer is immune to being frightened.
Notes: Value: 1,750 gp, Requires a Barbarian or Fighter