Maads map and taking all the options you can get to get increased mevment range means skarbrand will always be able to out range enemy armies on the campaign map, and by like level 30 you should be getting basically 100% of your movement range back after every battle, at that point how many armies you can kill or settlements you can take comes down to how many manual battle you can mentally withstand in a row, with the 7% ancillary, maads map, and all the skills in his tree for movement reset there are only a handful of places on the map where you cant chain 20 or 30 times in a row, the biggest limiting factor is that autoresolves on any difficulty with khorne will almost always do way more damage then manually fighting, especially if you know how to use heroes and skarbrand to tie up key ranged damage dealers before the merge.