To have this spellcaster join the team was purely a matter of luck.
The process was tedious, so I will spare the details.
To summarize briefly, it was six years ago when Bern encountered a storm during a mission that led him off course to a remote sea area rarely visited by anyone, where he discovered the individual being persecuted as an evil demon by the Primitive Tribe living on a nearby deserted island.
A spellcaster naturally attuned to nature, born with such affinity!
The Primitive Tribe was simple-minded, with little contact with the outside world, and coincidentally a plague was rampant; Bern at that time managed to lure the individual onto his ship with just a few bags of provisions, half a bottle of Healing Potion, and some worthless crude medicines.
Afterwards, he took careful care, blending lies with sincerity, and provided substantial resources for nurturing.
