Fusion weapons work by producing a small-scale fusion reaction using a pyrum petrol fuel mix. This is projected as a blast of incredible heat. Fusion weapons have a short range but are very powerful and are favoured for use against armoured targets. Fusion weapons are capable of rapidly incinerating armour which would normally be immune to most squad-based weapons (obstacles, tank armour, powered armour etc.). Fusion weapons are useful squad support weapons in situations where "excessive firepower" is an oxymoron.