Wasn't the stealth skill from Blackie when it died? I thought the final gratitude skills were temporary. If I'm wrong let me know, I don't remember if he had a stealth skill before Blackie died.
Comment by Noona on The S-Classes That I Raised - Chapter 141
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@Noona if i'm not wrong he obtained thta skill when he defeated an e-rank or d- rank dungeon solos as a f rank hunter