Flamer

From Exterminatus Manual

The Flamer is a chimical weapon carried by the Specialist that works by igniting a jet of highly flamable and sticky promethium at high pressure, ignitign anything infront of it. It's role is that of close support, area denial and inducing terror in the enemy by setting them alight. By target terrain (walls, floor, ceiling etc.) an area can be denied to the enemy for a short time as the promethium will stick to the surface and continue to burn for a period of time. Short burst can be use to ignite stealthy enemies such as the tyranid lictor, making them easier to detect.