The concept is Interesting, but doesn't write the story for you. This will be a lot of work beyond controlling various diseases. Unless you can characterize the diseases so they become an integral part of the story.Also, this concept has 50% more potential if you can make diseases from the symbiotic bacteria that support and help the larger lifeform they inhabit, and turn them into your Support Pet that gives permanent buffs.The concept has another degree of potential if you can make layered disease arrays. The idea is to have your probiotic buff colony help control your disease attack colony, taking a lot of the pressure off of you to directly control each instance of your Diseases. With these formations and systems of Diseases, you can recruit and reward allies in addition to tearing down individuals. And it makes surgical strikes possible, rather than just being a Plague Bearer Demon Lord.