A Dragonslayer's Peerless Regression is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Zeke Draker, the first direct descendant of the Dragon Slayer family to fail awakening. Possessing the talent of a healer instead of a swordsman, he was cast out by his family. Struggling desperately to grow stronger, Zeke met a tragic end. At the moment of his death, mysterious words appeared before his eyes: [The soul of an Elder Dragon is engraved upon the will of the one who persists.] [An irreversible, promised power is being activated.] When he regained consciousness, he found himself back in the Dragon Slayer family that had abandoned him, 20 years in the past. "If I can become strong, I’ll make use of anything and everything." Armed with a newfound, immortal power, the legend of a Dragon Slayer in a class of his own begins.