Luka, a 4-star character in Honkai: Star Rail, can be strengthened by farming the correct character Ascension materials. These materials include Ancient Part, Ancient Spindle, and Ancient Engine, which can be obtained from Robot Settlement and Great Mine locations. Luka’s character Ascension also requires Broken Teeth of Iron Wolf, which can be farmed from the Shape of Spike: Stagnant Shadow activity. Players can also use the Synthesizer to obtain these materials.
In addition to Ascension materials, Luka’s Traces (abilities) also need to be leveled up. The required materials for this include Ancient Part, Ancient Spindle, Ancient Engine, Obsidian of Dread, Obsidian of Desolation, Obsidian of Obsession, Regret of Infinite Ochema, and Tracks of Destiny. These materials can be farmed from various activities and enemies in the game.
Both the Ascension and Trace leveling processes require a large amount of EXP materials and Credits. Players may need to farm these resources, including participating in the Calyx (Golden): Bud of Treasures activity, to obtain the necessary amount. It is important to note that farming these materials can be time-consuming and may take several weeks to fully level up Luka.
Overall, thoroughly farming the correct Ascension and Trace materials is crucial in ensuring that Luka reaches his maximum level and unlocks his full potential in Honkai: Star Rail.