Heat Ray
From Jenny Everywhere Wiki
Heat Rays were a favoured weapons of the Wellsians who settled on Thrash. Juliet-178 believed them to be one of the most “unusual and powerful” sources of heat in the Multiverse, prompting her to want to try to use one to melt Madame Tarsa out of her ice prison after Juliet and Arganthone-056 were tasked with solving that problem by Pythagoras-858 in December 2020. (PROSE: The Time of the Toymaker)
Behind the scenes
The Martians' ‘heat weapons’ debuted in H. G. Wells's public-domain The War of the Worlds, making the concept public domain.