This was the second functional treasure that Huang Yi had acquired; the last one he'd obtained was the 18 eye orbs of Hydra Death Scales, which was an S-class treasure capable of seeing through the past and future, with an incredibly powerful effect. By comparison, the Talent Blood of Shadow Dance was somewhat weaker, only adding a 5% increase to movement speed when not in combat.
This ability was barely better than nothing. A 5% increase in movement speed was almost imperceptible, and the prospect of achieving anything significantly impactful was virtually impossible. After all, this was just an empty promise at the moment; having taken no action, Slark couldn't possibly offer anything of much value. This was simply human nature.