Pyroroamers are specially modified roamers with the ability to explode if killed.
They are the "upgraded" Roamer in all 5 Geneforge games, and become available when a player gets 3 points in Create Roamer.
Pyroroamers lack a projectile acid attack and have significantly less HP than Roamers. However, they cost less essence and explode when killed. They can usually be killed in a single hit, and thus are designed to be used as walking bombs.