Miasma

Miasma was a form of plasma weapon utilised by the Romulan Star Navy in the 23rd century. It was a wide dispersal variant of the plasma weapon used in 2266 by the ChR against the USS Enterprise (NCC-1701).

At the turn of the 2270s decade, the miasma weapon had been mounted aboard warbirds. Three warbirds employed it against the USS Yorktown (NCC-1717) but the Federation starship was just out of range and escaped undamaged.