Fantasy: a Talisman Strikes the Abyss Dragon at the Beginning

Begin by reincarnating into a different world. A swordsman from a generation becomes a good-for-nothing boy in an orphanage? With no spiritual power and no magical fighting spirit, is this the beginning of a useless counterattack? No! I still have blood. Ding dong - Congratulations to the host for killing the abyss dragon with one move. The body has decomposed. He has obtained the dragon's armor and the dragon knows his heart... What? You said that black thing is an abyss dragon? Ding dong - Congratulations to the host for slaying the soul of millions of undead. The soul has been replaced and has been followed by millions of undead... I... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.