You prick a target with a tiny magical fang of venom. Make a melee spell attack against a creature within reach. On a hit, the target takes 4d12 poison damage and must succeed on a Constitution saving throw or becoming poisoned for 1 minute. At the end of each of its turns, the target can make another Constitution saving throw. On a success, the target is no longer poisoned.
If you miss your melee attack roll, you can concentrate (as if concentrating on a spell) to maintain the attack for another attempt until the end of your next turn. (You may make subsequent attempts until you hit or lose concentration)