Elemental blade

You summon an elemental longsword to your hand. You can choose its damage type, fire, cold, lightning, acid, force or poison. On hit the sword deals an additional 1d4 of that damage type. 

At higher levels: You add 1d4 for each 2 levels upcasted, so at 3 rd, 5th, 7th and 9th, additionally the d4 becomes a d6 from 7th level and up.

Duration: 3 attacks or up to 1 minute