I was looking for the Aether biome to get shimmer and I found this strange church/shrine with a statue that holds a bow and arrow with a very small pool of shimmer at the bottom of the structure.

I right clicked the statue and it started a "trial" of sorts where I had to dodge different hazard patterns where I'm only allowed to get hit four times or the trial ends.

I kept trying and trying, thinking that beating it will increase the shimmer levels, but after beating it with one hit left, it gave me a magic mirror and tarnished ring.

I can't try the trial again because it says the shrine has gone dormant.

Is this the only source of shimmer in the world or do I need to keep looking?