I played 403 as Abysia with this pretender, and there were soooo many times that I wished I had made a rainbow sage instead:
Also, at the end of the game I had 2N and I don't think I ever had any N income, but I had no N site-searchers and no mages with N at all. It's literally not possible unless you find a place to hire indie mages with N skill, or your pretender has it.
I didn't do very well, but I can point to some reasons why:
I invaded three people at once early on in an attempt to grab four thrones, one of which was deep in Ur, and I was just assuming I could punch my way through their territory because it LOOKED undefended, but my entire Ur-invading army got clobbered the second it stepped into their territory, and then a massive army came back out and took several of my provinces. Of course, I successfully took a ton of Mictlan's provinces and then their throne, but they really WERE basically undefended. I also failed in my attacks on both of the thrones to my south, held by Berytos, one of which had a hero at it, who my Demonborn failed utterly to kill, but Berytos didn't want to pursue a war, or I'd have ended up in a three-front war instead of a two-front war. I lost most of my armies at the time by doing this because I overestimated the effectiveness of my troops and underestimated my targets' troops.
I also ended up in permanent war with Ur and Mictlan. Of those, Ur was the real threat, and Mictlan was only a threat because I couldn't send my capital-defense army far enough to crush them conclusively (their jaguar warriors might as well have been made out of butter - the few victories they won were largely against either armyless provinces, indies I had hired, or mercs I deliberately suicided into their army because their contract was about to run out #VaderWouldBeProud).
As for Ur, they had 200-300 troops and 25ish mages in their army, so when they first showed up to besiege my capital, I had my army sit inside while assassins killed their mages/commanders, until they finally called off the attack for a while (they attempted to return, but then we get signal: all your base are belong to tompliss).
That reminds me, in my province information for the under-siege province, the turn before Ur's army completely left, the supplies were about to run out in the province while I was under siege. I was assuming at the time that those were my supplies, and not the enemy army's supplies. Is that correct?