Wow, you're a monster, completing it in 13 days!! It's strange that you couldn't beat the Necropolis. What troops did you have? If you don't recruit the Rakshasa, it just moves forward, but if you do recruit it, it basically stays in place.
Well, if you fought the Sphinx, then you must have gained a lot of experience. What level were you before the final battle??? I was level 20, and they gave me another level after the battle.

I knew there would be very close results.:)

My mistake was probably that I took Mountain Guards instead of Bears for the battle with the wolves. I had to disband them before the battle with the Necropolis. Otherwise, the vampires stay in place and don't get hit by the fireball. And with that setup - 6 mages, 15 golems, 43 gremlins, 16 Rakshasa, and Nazira at level 15 (without spellcasting) - I was still missing 2-3 Rakshasa to win.:(
After the Sphinx, I reached level 18 and gained Expert Spellcasting, and I even won on auto-battle.