ERftLW: Serpent Missile

Writhing bolts of energy leap from your hand, and strike a target you can see within range. The target must make a Constitution saving throw or take 3d6 poison damage and is poisoned until the end of its next turn. On a successful save, it only takes half damage and isn't poisoned.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, each target takes 1d6 additional poison damage for each slot level above 1st.