[Endoperez]

With your pretender (few high magic paths) you can just call him back (have priests Call God - command only available after He is dead). He will lose one point from every path, but that shouldn't hurt too much, as you still have at least level 3 in all and that is enough for boosters.

You might also want to try to find a nation that suits you. You have a playstyle (you use lots of mages), and instead of changing it to play a nation you should change a nation to play as you enjoy. Especially if you have played BASE Ermor (recruits units, instead of getting free undead as the other two themes) you don't really have that powerful mages. Caelum has very good mages (flying, cold immune, water gives quickness and lightning good attack spells, CHEAP). Jotunheim Iron Woods and Utgård have cheap mages (Vaetti Hags or Seithkona), powerful province defence (you are very good in defense, so you can research high-powered spells). Iron Woods' other mages are hideously expensive, but at least one in four Vaetti Hags can bloodhunt and about half the undead are Giants. Utgård is probably magically more powerful, and all those researching Seithkona become EVIL after you get Evocation 7 and Nether Darts.
Pythium has very good starting income, good and flexible mages, and can use communion to boost battle magic beyond awesome. The Theurgs have Water, Air and Astral, which give them Quickness, some good attack and protection spells and some awesome high-level spells. Also, remember your mages can use both Luck and Body Ethereal not only to themselves, but to legionaires as well.
Machaka has lots of mages, of lots of paths, and Machaka Hoplites are very good.
Arcoscephale has high Astral and will get good Elemental mages in time. They also have lots of mixed magics, so use Power of the Spheres and/or your choice of Quickness, Magma bolts, Acid Bolt, Sulphur Haze, Rust Mist. Their priestesses can heal afflictions of non-undead pretenders, and their province defense isn't as worthless as Pythium's and Machaka's.