The berries cause euphoria when eaten, so it’s clearly possible for them to alter brain chemistry through seeping into the body after ingestion, like a pill. I think it alters that chemistry to form an attraction to the Mycus, and a drive to further progress down that path, with your reward being drug-like euphoria.
Marloss berries are a very strong substance, and so eating them affects you in strong ways. I personally imagine that the spores are created because, once you’ve eaten one marloss berry, you no longer technically need any more, and so it simply disperses into spores, given that it was fungal matter beforehand anyway. I generally think that it houses dormant spores like an apple houses seeds.
