While many considered life and death as two different entities that clash with each other Damon was made to understand something after a long while. Life and death were simply different sides of the same coin and for that reason, one cannot exist without the other.
Many would expect a death mage to learn only destructive abilities and pathways but Damon soon discovered the branch of death magic power which Sol, the original God of death did not even bother investigating properly.
He is the only one who sees the potential of life within death and that's why he was very much interested in gathering all the powers of the host and becoming the perfect host.