Anti-tech Field
After experiencing a world-wide crisis, its rivers blackening, forests and jungles burning and receding, its oceans becoming toxic, and its once-lush, verdant plains growing less and less viable for life, Yalasra had enough. Seeing advanced technology as the source of its trauma, its spirit pushed out with its great, celestial will, and dictated No More. No more would factories pump pollution into its seas and air, no more would mankind's elaborate devices and machines litter and poison the earth. This meant, from that point on, that no technology past a certain level of sophistication could work on the planet.
It didn't matter if the device or machine should have worked, or even worked fine in another world or plane of existence - Yalasra's will was strong enough to overcome these particular rules of physics, at least on a cosmically local scale. This planet-encompassing phenomenon became known as the Anti-tech Field, slight misnomer that it is.
Over the milennia, the planet has healed, and evidence of the damage it endured has long since been reclaimed. Very little beyond written records remain of the time Yalasra's peoples called themselves advanced, and there is practically nothing left of the electric, gas, and metal tower cities of old. What does remain, when discovered in modern times, is often left alone, but sometimes it gets recycled for materials to be used in new, environmentally safe projects and endeavors.
Mechanically, what this means is that only technology that gets no more advanced than steam-powered or clockwork workings are allowed to function. This means computational devices that one would see all over Terra, gas or oil refinement facilities, and other numerous varieties of sophisticated devices, simply do not work. Even a number of Vruanhai's more advanced lefvada-powered devices struggle to work when brought to Yalasra.
On occasion, however, Yalasra can be reasoned with, however slowly, to allow certain particular devices to function as they should.