Fairy: Heal Mirajane, Black Dragon Template

Having transmigrated into the world of Fairy Tail, Ron becomes a healing mage. He starts by healing Mirajane and obtains an enhanced version of the Black Dragon template, thus beginning his journey to domination!
Later, through healing Eileen, Mavis, the Moon Goddess Selene, Ur, Brandish μ, and so on, Ron's strength gradually increased, and he built the strongest guild, ultimately ruling over Ishgar, Aragidasia, Kiltina, and so on.
During the final battle against the Black Dragon, Ron, who had fully fused with the Black Dragon's Heavenly Template, pushed the Black Dragon Acnologia to its limits with just a slight movement!