The Amra's power
The Amra didn't seem to have a wide use of technology like that of Earth, or even the other alien races, but that wasn't because they never had the technology in the first place. This was mainly due to the set up that the previous leader, the celestial had done.
The celestial had made sure to stop advancements, to slow down the enjoyment that technological devices could bring and the ease of life it would bring to the Amra. At least, slowing it down to the point where these things wouldn't be available outside of the tower.
This way, the Amra would only have few dreams, and the main dream of accomplishing what they wanted was by entering the tower. It was all to help with the condition of Athos, the celestial.