Vesta/Chronology

Empowerment
He requested Kaijin and co. to create 200 steel spears and 20 magisteel swords, fully aware that Kaijin will struggle with the order.

He later discovers the group at a nightclub and mocks Rimuru. This caused Kaijin to punch him, leading to the group's arrest. He bribed their lawyer to frame them, but Gazel Dwargo knew the truth and exiled them instead. After Rimuru and Kaijin's group left, Gazel expressed his disappointment at Vesta's actions and stripped his title of minister.

Demon Lord Attack
He was brought to Tempest by Gazel to work under Rimuru. After apologizing profusely for his past actions, he was tasked with creating healing potions.

He and Gabiru are rather compatible. Because of that, he was allowed to reside in the Sealed Cave. The cave happened to be the perfect atmosphere for science experiments. Gabiru assigned two of his subordinates to guard Vesta. Later, he joined with Lamrys in her labyrinth to conduct research. Vesta received a humble home on the outskirts of the 95th floor's city; allowing him a peaceful place to sleep and research on his own a safe distance from the city.