Archvale

There is one trial location in each major world/segment of the game. You’ll find them in areas without enemies, appearing as a pillar with a stone suspended above. Enter it, and you’ll be in a circular, moon-like arena. Once you touch the switch in the middle, a blue gem appears and orbs show up on the edges of the arena. The goal is to touch the gem six times per round (three rounds per trial) without being hit by various projectiles fired from the edges. The gem moves each time you touch it.

Some of them are reasonably easy, and others are more challenging, especially the third round in each trial. The good thing is, once you complete a wave, it’s done. And if you take a hit, you only have to start your current wave over by touching the switch again. As near as I can tell, there’s no time limit, so there’s no need to rush towards the gem and take a hit. Once all three rounds are completed, there’s a chest that appears with a powerful reward.