Wounds inflicted by Valten in close combat are counted towards the Empire combat resolution score of any combat within 12" of him, not just the one he is taking part in.

When wielding Ghal Maraz, the number of wounds passed on to other combats within 12" is the number inflicted before multiplying the effects of the hammer. The total number of wounds caused still count for the combat Valten is fighting in. For example, Valten is fighting a unit of Minotaurs. He inflicts 3 wounds, which cause 2, 3 and 3 wounds respectively. For his combat, he adds 8 to the Combat Resolution total. For other combats within 12" he only adds 3 to the Combat Resolution total.

Valten may not be your army General unless he has the highest Leadership value in the army; if there are characters in the army with the same Leadership as Valten, one of those characters will always be the General instead. Even if Valten is the General, units within 12" of him may not use his Leadership as they would normally be able to - the Awesome Presence rule replaces this.