Viper Whip

you conjure a 15 feet long magic viper in your hand. it lasts until the spells ends. it counts as a simple melee weapon in which you are proficient in. it has 15 feet of reach, has the fineness property, and on a hit, deals 1d12 piercing damage, and the target must make a constitution saving throw against you spell save DC, taking 3d10 poison damage and is poisoned for a minute on a filed save, and takes half as much damage and is not poisoned on a success.

at higher levels. if you cast this using a spell slot of 4th level or higher, the poison damage increases by 1d10 for each level above 3rd.