Your body has gone through a metamorphosis similar in nature to Kodoku, a method in which someone would mix various insects in order to create the perfect poison. Your body has gone through a similar event as it was turned into a breeding ground for various poisonous creatures and plants. It combined to make the perfect poison. You. Your body has changed, granting you control over the various creatures that play host to your body, including but not limited to various poisonous insects of the highest caliber, such as spiders, poisonous centipedes, and other dangerous insects; plants such as nightshade, water hemlock, white snakeroot, castor bean, oleander, and so much more.
Your body has adapted to and becomes immune to poison. and generates poison in your blood, sweat, and the rest of your body. You start with poison deadly enough to kill even those with a high level of regeneration and superhumans slightly above peak humans. However, the more time that you spend alive, the more deadly your poison becomes, as the insects that have become your new body create deadlier poisons. You can also increase the potency of your poison by ingesting poisonous or other deadly substances, giving you access to the substance and allowing you to produce more potent versions of the substance.
So long as even a single insect remains, you can reconstitute your body. You can also hijack a person by infecting them with your insects and possessing them, turning them into a new control node for your insects. Each body is stronger than a normal insect, being able to handle around five times the damage you would normally be able to and being just as strong. This also gives you rudimentary control over nature, but you can only control and grow plants that are poisonous.