Bolt of infection is a powerful poisonous spell that requires level 78 Magic and the completion of The Poison Project to cast. You must also be on the Mephitic spellbook in order to use the spell. When cast, a giant snake is summoned and propelled at the opponent, hitting a maximum of 389, and there is a 1/5 chance the opponent will become poisoned, hitting 60 damage at faster rates than weapon poison, decreasing incidentally by 5 damage per poison hit.