🗿 notawikiAcross the Obelisk Codex · the answer, not the article

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Matey
pet  Pets · Unlockable pets
Slashing, Lightning resistance +3%. [Every turn] Cast card Peck.

🃏 Its card: Peck

Deal 3 Piercing. Apply 1 Insane. Repeat 1.

Corrupted (purple) version
Max HP +5. Slashing, Lightning resistance +5%. [Every turn] Cast card Peck [Corrupted].

🔑 How to unlock Matey

In the Sahti Islands, there will be an uncommon event 'The Sunny Beach'. Here you will find a pet trainer who will sell you Matey for 400g, or if you pass a skill check Group [6 or higher], will sell the corrupted Matey for 400g.