The cinderblast bomb is a missile weapon that fires like a stone thrower, but the model can march and fire with the following profile and special rules:

When resolving the scatter distance, halve the number indicated by the Artillery dice. If the artillery dice result is a misfire, roll a D6. On a result of a 1, centre the template over the thrower and work out the damage. On a roll of 2+, the bomb is a dud and nothing occurs.