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He'sSss All Mine
Acquire Salverun.
He'sSss All Mine is a 15-point achievement earned by acquiring the 
Salverun battle pet, which requires farming Kob'rok in Zaralek Cavern, collecting Sniffenseek materials, and completing a ritual to summon him.
Farm Kob'rok in Zaralek Cavern
Hunt the rare spawn Kob'rok in Zaralek Cavern until he drops a 
Kob'rok's Luminescent Scale — this scale is required to begin the Salverun crafting process and does not drop the pet directly.
Run Sniffenseek Each Week
Use your Kob'rok's Luminescent Scale with Sniffenseek to locate 
Hidden Niffen Treasures; you appear to be limited to one Sniffenseek item per weekly reset, so open your treasures after each run and continue the following week if needed.
Collect Tablets and Designs
Hidden Niffen Treasures have a chance to contain a basic 
Ouroboros Tablet along with several designs, including 
Designs of Flesh, 
Designs of Bone, 
Designs of Mind, and 
Designs of Soul.
Complete the Ritual
Combine the collected tablets and designs to complete the ritual, which will result in your Salverun battle pet and award the He'sSss All Mine achievement, which also counts toward A Niffen's Best Buddy.
Tips
Because you appear limited to one Sniffenseek item per weekly reset, this achievement requires a minimum of several weekly resets to accumulate all necessary materials.