"thalaron radiation is an alien weapon, especially of the remans"

One way to approach this is by writing in detail what "especially of the remans" actually means. For example "used mainly by the remans", "mostly developed by the remans", "having been made known by the remans", etc..

On the other hand, perhaps we could avoid going from New York to Los Angeles through Chile, by simply writing:

nov nuH 'oH thalaron woj'e', 'ej rIymuSngan nuH 'oHchu'.

Of course, if anyone has a better idea, then qeylIS knows, I'd love to hear it.