"Palytoxin is an intense vasoconstrictor, and is considered to be one of the most toxic non-peptide substances known. The onset of symptoms in a palytoxin poisoning is rapid, and death usually follows quickly - during 5-30 minutes after intoxication.
Palytoxin is a natural compound that is produced by zoanthids - an order of cnidarians, class anthozoa, commonly found in coral reefs, the deep sea and many other marine environments around the world. The toxin presumably produced by the virus which is in symbiotic relationship with zoanthids. The Hawaiian natives long since used zoanthids for preparing poisonous weapon."