What i did to make this work is i indeed do the mage part at the start with the passive of Nailuj's Evol ring, after that i wont summon mages but i will just let my skeletons wack the mobs without using any skill at all (you do need Taskers & Theo for this to work though), and spam Land of the Dead (also try to have some CDR in your build, it will help because when you cast Land of the Dead it adds seconds to the timer as well). Then when i have both quests done, i just rush through the dungeon with skeletons and mages.
Hope this will help you, Good luck!
Edit - sorry i didnt't read that you already did it, My bad!. I dont know how to delete my post though :/