Viper Bracers

While wearing these twisted, emerald green
bracers, you can use your reaction when a
creature targets you with a melee attack to
make two unarmed strikes against it. For
each attack that hits, that creature is
poisoned for 1 round, ending at the start of
its turn on the round that it would end. This
property of the bracers can't be used again
until the next day.