Hi for, those solos who are stuck getting the engines full. At towns square there is a propaganda cart in that place and just outside. By breaking it down and fixing it again, you can use the resistance posters to full your Aether bar up again with only around 6 - 7 posters. I know the engine may take quite a while to full up, but when I tried I filled it up about 10 - 15 times and it worked, the Aether engine filled up a bit more. Also, it can be quite a pain getting those posters, but by coming each day, you are guaranteed to get more so start saving, I definitely had been saving for weeks to get that good over one hundred. So it definitely is easier with others.