Amalgamagic

Touch a weapon of any kind to cast this spell on, the weapon then emanates with chaotic but composed energy. On a sentient weapon that wishes not to receive this effect, the spell is dispelled. The next time the weapon hits a creature, it deals an additional 1 damage Magical Bludgeoning, Magical, Slashing, Magical Piercing, Acid, Poison, Cold, Fire, Force, Psychic, Lighting, Thunder, Necrotic, and Radiant damage. Once a weapon with this effect hits, the magic becomes unstable and it is dispelled. Casting this spell again on a weapon already affected will stack effects.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you can change the 1 damage into a dice of higher level depending on Spell Level for each type of damage respectively, ranging from 13 1d2s at 2nd level to 13 1d100s at 9th level.