A group of henchmen collecting coal from coal piles.
In Impossible Creatures, coal is one of the two resources needed to create combined creatures and henchmen, construct buildings and research various upgrades. The other resource is Electricity.
Coal is found as lumps as seen in the image to the right, which can be found in various places across maps. However, there is always at least one coal pile very close to the player's Lab. The player may use henchmen to collect it, who then return to the Lab or Workshop to deposit it. The player begins a game with a small amount of coal, but more must be collected to support their economy.
The coal cost of a combined creature is influenced by its stats. A powerful creature with high stats will cost more coal than a lower-ranking one.
In Creature Chaos, a Workshop can convert coal into electricty and vice-versa.