Bingowings said:

Terrestrial doesn't work on many levels.

For one thing this is a mythical fantasy realm where, to our knowledge, there is no Earth.

Also the word is like saying Naboo is French, rather than like France, of Earth rather than like Earth.

well yes "terrestrial" sounds strange, better leave it out or change to "inhabited" or something similar meanig it is "Earth-like"

@Bingo you aren't 100% correct, Star Wars states to have been: "in a galaxy far far away", so our worlds could coexist ;-)

one thing I find worded bad is the end: "... before a war can begin" - hm, sounds not as if they are there to STOP it, more like to delay it ...

maybe put it more in line as "before the conflict would end in (a) war" ?