Torch Goblin
A band of three from a cave at the forest's edge: quick and fragile, their torches light everyone round them for both sides.
The band comes out of its cave together when a unit passes near, and chases the nearest one. Each goblin is quick (119) and fragile (56 hp), and hits for 5.1 every 1.12 s.
Their torches burn a hole 130 wide in the fog of war for both players: a band out of its cave is seen from afar, and so is whoever fights it.