The Forge Guard passive ‘Fresh From The Forge’ is consumed when its up and you’re using, or you start using, warpath. The passive states it excludes movement abilities, and warpath doesn’t get any increase when its consumed.
Tested Lunge, Shield Rush, and Void Cleave; they all work as intended and don’t consume the passive.
((And realistically if there were to be an exception to the exclusion, void cleave would actually work super well with this passive, and not in a broken way as it’s not a % increase (which could cause problems with the eternal eclipse weapon)))