“The Magisterium of the Pope and of the bishops has no authority over the substance of the Sacraments. Therefore, no synod – with or without the Pope – and also no ecumenical council, or the Pope alone, if he spoke ex cathedra, could make possible the ordination of women as bishop, priest, or deacon. They would stand in contradiction to the defined doctrine of the Church. “It would be invalid,” - Cardinal Gerhard Ludwig Mueller
Think about that when the synod starts spouting heresy and taking the local churches in various places into schism.