Frostbite

An exquisitely crafted morningstar seized from
the armory of Hrakhamar.
{1} +1 to attack and damage
{2} Frostbite: On a hit, the target must make a
CON saving throw (DC-12). If failed, the target
takes 1d6 cold damage, and it has disadvantage
on its next weapon attack (only 1 attack).