That's not elaborate at all... You didn't include the attack/defensive stats, What the unit is named, what the unit looks like, what the unit can be used for...
It should not be a unit, but an officer like the deceiver. Travel at treb speed maybe, call him an engineer. Gun powder was in ancient china, so maybe the engineer is a china man, or lady
Along the lines of adding a new unit, How about a new building, or a hall addition to manufacture officers and bonus items for an ungodly amount of resources?