Dual Imbue Weapon

You touch a non magical weapon and imbue it with the power of two different magical forces. Choose two of the following damage types: Acid, Cold, Fire, Lighting, Necrotic, Poison, Radiant.

For the duration of this spell, the weapon becomes a  weapon and deals an extra 1D4 damage of both chosen types when it hits ( rolled seperatly). You can change your two chosen damage types using a bonus actionif the weapon is within 30 feet of you.

At higher levels.  When you cast this spell using a spell slot of 5th or higher, the damage for both damage types increases by 1D4 for every two slots levels above 3rd.