Conjure Dark Matter Beast

you point your finger at one target within site, once you then say the activation phrase "fetch" a Dark Matter Beast (one of your choosing must be medium in size) appears at your side and starts sprinting at the target taking a swipe at the target, they must make a Dexterity saving throw in order to dodge the beast if failed the target takes 3d10 necrotic and 1d8 slashing damage, at higher levels the slashing damage goes up by 1 dice