Bone Spikes

You summon a small patch of etherial bone spikes to emerge from the ground under your target. Choose one creature within range, or two creatures within range that are within 5 feet of eachother. A target must succeed on a Dexterity saving throw or take 1d6 necrotic damage, and fall prone. This spell’s necrotic damage is increased by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).