Poison

"Damn, this isn't looking so optimistic." Rui cursed as he read through a research journal.

He had spent the past week pouring through all the literature on the topic, occasionally consulting Julian when the esoteric scientific jargon went over his head. Turns out Julian was entirely correct when he told Rui that there was a large degree of incompatibility between the field of poison and symbiotes.

One thing he did appreciate was the fact that there was an abundance of research on the topic. This was because a lot of the test subjects that were used to conduct the necessary experiments were actually animals. Since a lot of these symbiotes were able to take root in other animals, the effects of poison-based techniques were easy to observe.