Honkai: Star Rail, like Genshin Impact, uses an RNG-based gear system that can make you weep or gag if a five-star piece you've leveled up doesn't get the stats you want. In this game, they're called Relics, and they now come in two different types: Relic Sets and Planar Ornaments. You can farm them in the Caverns of Corrosion and Simulated Universes.
FFXIV – Anime Campaign AND PEGI (30s)
Want to know which Relic Sets work best for each character? We've got a comprehensive list for you right here.
Note that you should wait to attempt to obtain these relics until you’re at equilibrium level five. We see that at level 60+, your runs will always drop two five-star gear, with one of them rolling four substats (instead of three) by default. Of course, the chance to obtain the best relics for Trailblaze power is greatest at equilibrium level six.
Related: Honkai Star Rail Cavern of Corrosion guide: all locations, team compositions and more!