From Melvor Idle
This page is up to date (v1.2.2).
Pet ID: melvorF:Pablo
Source: Into the Mist
Drop Chance: Guaranteed after 5 clears
Effect: +2% Damage To All Monsters
Part of 100% Completion: Yes

Pablo is a boss pet acquired by completing Into the Mist. Unlike other Boss Pets (excluding Bone), the chance of receiving Pablo is not random. Instead, he is guaranteed to be unlocked after the dungeon is completed five total times.