"The Old Ones had used curious weapons of molecular and atomic disturbances against the rebel entities, and in the end had achieved a complete victory." ~H.P.L.
Just a few quick pictures of the Elder Thing with disruptor weapon. I wanted the design of their weapons to be very Baroque and semi-organic without being bio-mechanical. These weapons can be fired in various ways. A lower setting produces uncomfortable heat and blistering, this is the setting most often used to control wayward shoggoths. By increasing the power of the weapon the Elder Things can cause biological material to boil or burn. And at its highest setting it will rip apart molecular bonds with highly explosive results.
The only disadvantage to using these weapons is that the range and power must be set before firing and so fast moving targets often avoid the worst effects. It is noted in At The Mountains of Madness that the Spawn of Cthulhu and the Mi-Go seem to be able to avoid some of the disruptor's effect by nature of their odd physical reality, although this might only be revisionist history on the part of the Elder Things to explain defeats in battle by these foes.
The Elder Things will also be getting a large scale cannon weapon and close combat troops. The Elder Things miniatures are available here: