Metamagic: Explosive Spell

Spend Sorcery Points equal to the Spell level and the spell you are casting becomes an explosive spell. The spell must have an area of effect (cone, burst, sphere, line, cylinder, square, or cube) and if the spell not instantaneous then the explosion only happens when the spell ends. (End of duration, loss of concentration, or spell ending voluntarily. Not if the spell is countered or dispelled, those also end the metamagic effect.)

Anyone in the area of effect of the spell that fails their saving throw is also thrown away from the center of the blast area 5 feet per spell level, and fall prone. They do not provoke opportunity attacks. If they cannot move their full distance due to an obstruction, they take falling damage, 1d6 Bludgeoning damage for each 5 feet they are unable to move. (Even though this is a magical spell, any bludgeoning damage is considered from a non magical weapon)

Structures would take quarter damage from the people/loose objects in the blast area. So it is possible to be blasted through walls.