With their combined investigation into Davil's status, they would find two things. For one, his bloodstream would have some manner of purple liquid seeming to meld into it gradually, slowly inching towards his heart. The other, staying near the stomach wound, would be nearly imperceptible metal fragments and chippings; practically dust, in how hidden it is to the naked eye. It doesn't seem like it was intentionally left in, but is perhaps a side effect indicating damage in the implement used. It would be reasonable to assume that whatever was used to slash open Davil's stomach was also the weapon used to inject what could realistically be deduced as some kind of fast-acting venom. Perhaps so potent as to degrade the very blade it was applied to.