In Honkai: Star Rail, the Relic Sets are an important system that can greatly enhance the strength of characters. These sets function similarly to the artifact sets in Genshin Impact, providing unique bonuses and effects when equipped to a character. Relic Sets come in different rarities, up to 5 stars, with higher rarity sets providing generally stronger bonuses and ability to upgrade further. The addition of Relic Sets adds an extra layer of strategy and customization to the game, allowing players to tailor their characters to fit their play style and objectives.