Weighted Tether

On your turn, make a melee spell attack. If you hit your target, they become infused with a kinetic lash that binds them to the earth increasing the effort required for any physical action. For the duration they have disadvantage on all attacks and physical saving throws, i.e. STR, DEX, and CON. This lash lasts for a number of rounds equal to the ability modifier used to cast this spell minus the target's constitution modifier(minimum 1). On subsequent rounds, for the duration of the encounter, as a bonus action, you can attempt to apply this lashing to another target up to a total of 2 additional targets.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you can target one additional creature for each slot level above 1st.