Chaos meant unpredictability, and unpredictability meant opportunity. Damon was someone who thrived on chaos. If he freely spread his bodily fluids across this world, then it might fuck up a lot of things. The whole timeline from his past life would be thrown out, and everything that happened would be new.
Not that it mattered. Thanks to him, the timeline was already beyond recognition. He couldn't possibly do any more damage to it. In fact, whatever he does would only screw up the other big shots' plans.
Heck, his spit had the power to even fuck up the many Gods' plans!
Damon still had no clue about many things, like who these so-called Gods were and which Gods had their eyes on his world, and what plans they had in mind for the future, and so on. But he knew it couldn't be anything good.