Encapsulate

This spell must be cast in conjunction with a spell or cantrip that instantaneously affects an area from a singular point (spells with prolonged effects or those that affect multiple points like wall of fire or fire storm are excluded), and requires a Dexterity saving throw: i.e. acid splash or fireball. Weaves of magic wrap around the spell, causing it to burst forth with greater power. Dexterity saves made to avoid the spell are done with disadvantage, and if a creature fails the save by more than 10, they are knocked prone.