Choose a target within range that you can see. The target starts to see quasi-real shadow hands in its peripheral vision or hearing silent voices as if someone was speaking one foot behind for the duration of the spell. The shadow hands or voices follow the spell targets heads movements. Succesful intelligence (investigation) check reveals those hands or voices to be an illusion. Other creatures can see the shadow hands or hear the voices with a successful wisdom (perception) check. When touched these hands feel like touching a puff of smoke. When heard these voices sound like casting a spell in a language that the person casting this spell knows.
At higher levels: When you cast this spell using a spell slot of 2nd level or higher, you can target one additional creature for each slot level above 1st.