C437 Flame Lord

Feng Yixiu meticulously placed the platinum-ranked demon spirit card into the Grimoire of Demon Spirits for safekeeping.

This was his inaugural platinum-ranked card. Though he wasn't destined to absorb it, the card was crucial for his short-term ability to engage in aerial combat.

Once he allowed himself to relax, Feng Yixiu felt a wave of exhaustion wash over him and quickly succumbed to sleep