Waves of Erosion

waves of erosion considers the spell's user as its point of origin. these waves move outwards in a spherical formation, spreading the erosion. it takes the force of anything it touches, the sphere's area of effect can be extended depending on the use's area of touch. targets of the spell need to do a dexterity saving throw if they fail they are slowed down and for ever target that gets in its area of effect they'll take 1d6 necrotic damage for every second there in it's area