Im looking for a novel
I only remember a bit of the story
1. Mc is male
2. Mc got some artifact that help him got a furnace/flying magic lab empowered by a dragon gems/heart
3. Mc is researching undead immune to holy magic, he did make a squad of dullahan covered by holy equipment and make them pose as paladin
I really want to reread this novel but its been a month and i have no luck searching it
