Not the first time that's happened. At the end of ARR, we need literal divine intervention to beat Lahabrea (especially in the redone version, where he outright kills you before Hydaelyn steps in), but by the end of Heavensward, we take him and Igheyorhm down at the same time, including their merged Ascian Prime form. The WoL does canonically grow stronger all the time. We're like Saiyans or something.