In Search for two di-sticks's feed

Anyone know a manhwa/manga(???)... Ao story goes like this, mc adopted fam was killed by cursed knights (the cursed knights cannot take off their plate/armour and are immortal, they also are thirsty kilking mf) ans mc got a piece of that armour, so he is immortal, there's also those witches.. Ome of them is her sister... Ans god of death i think... I don't remember much aside from that because i read it when its ongoing and forgot to bookmark it ╥﹏╥