No one denies that trolls are naturally cannibalistic, or that they seem to spend half their time making war on other troll tribes. So how did they get to be one of the most populous races in Azeroth? The submitter Fakawot accidentally discovered the answer to this question when fighting Broggok in Hellfire Citadel. The beholder boss mysteriously perished while trying to devour Fakawot alive. Trolls must secrete some sort of toxin, similar to that of the poison dart frog, that is deadly to everything but other trolls.