The Anti-Toxin was an artifact used by Kain as a fledgeling vampire, during the events of Blood Omen: Legacy of Kain. When used the Anti-toxin would purify Kain's blood curing him of any poisonous infection. These artefacts were particularly useful around Dark Eden, where Kain was frequently poisoned by the toxic green blood of its mutant inhabitants.
- "This cleanses my body of any dangerous poisons. Quite useful, with all the filth I find myself surrounded by."
- ―Kain — Listen (file info)[src]
Following the events of Blood Omen, Kain seemingly abandoned much of his weaponry and artifacts; the anti-toxin is never seen or mentioned again.