gamboldan There’s none, as Amden and Luzern are not located within the same regional transport network or in partner networks. That’s why a point-to-point ticket is offered in this case in the webshop.
E.g. if you look up Zurich to Amden connections, then you’d automatically get such a (Z-Pass) network ticket offered.
Note that the chairlifts in Amden are “independent” so everyone pays full fare, regardless if you hold a Saver Day Pass / Half Fare pass or not.