A_Explode [(int damage[, int radius[, int flags[, bool alert[, int fulldamageradius]]]])]

Deals damage to all actors within a given radius of the caller. Damage drops off linearly after the fulldamageradius is passed. The only valid flag is XF_HURTSOURCE which is on by default and allows the explosion to damage the source (the source isn't the same as the caller). For example a missile without this flag will not damage the actor that fired the missile. Enabling alert will allow the explosion to wake up nearby enemies.