While he did >!revived Rerir!<, he didnt study and use Abyss power for himself.

For a mad scientist, kinda interesting how he doesnt use Abyss power. He more interested in the Moons, Irminsul and powers of gods.
Dottore seems to be not interested in Abyss. None of his experiments has Abyss energy and he doesnt even study Childe who has power of Abyss.