Disease - Tetanus

This disease, also called lockjaw, is typically from wounds with contaminated objects like rusty metal. Victims become more and more prone to violent spasms, headaches, fever & difficulty swallowing. Stiffness of the jaw is common.
Infection-injury; Con DC 14; Incubation 1d6 days; Damage 1d4 Dex. Each time someone takes Dex damage, there is a 50% chance his jaw muscles stiffen, preventing speech and the use of spells with verbal components for the next 24 hours.