Aflame (X) "A Weapon with this Special Rule causes additional modifiers to a Target's Leadership Characteristic."
If a Melee Attack made for a Weapon or Model with this Special Rule inflicts one or more wounds on a Target Unit, regardless of whether any Damage is inflicted, until the end of the Phase, that Unit is considered to be 'aflame'. If the Controlling Player of a Unit that is aflame is required to make a Leadership Check during that Phase for a Combat that includes that Unit, the value of X on this Special Rule is applied as an additional negative modifier to the Leadership Characteristic being used for that Check.