Idk how well known a fact this is but certain abilities don’t have to cost energy. Like embers inferno, if it doesn’t target anything it’s free. The thing is, it still gives affinity. So you can equipment natural talent for casting speed and find a safe spot in a mission and just spam the ability. Not the fastest way to gain affinity but it’s brain dead. Which means you could do it while watching a show or something or maybe program a bot to do it for you.
Nice way to rank back up after applying forma.