Why to skip the "all powerful" Save or Die spells:
Yes, Save or Die is powerful, we've all heard why (who cares how many HP the monster has? If they fail their save, the fight is over) - however, it is overrated. This is why:
Lots of enemies: You take down one and do little else to help your Big Stupid Fighter and Glass Cannon. You spent a high level spell doing so. Congratulations - you've been demoted from God to Glass Cannon. Ouch!
One Big Enemy: You either do nothing or everything. The Big Stupid Fighter and Glass Cannon are either in lots of trouble or are feeling useless. This is like the chess player who is addicted to using his queen - ends up losing it, and then sucks for the rest of the game. Use your lesser pieces (That's the big stupid fighter and the glass cannon - your peons) to your advantage - let them do the dirty work - your job is to make it easy for them, not to take their place. Try to take their place your spells will run out fast. Besides, you are a team, enjoy the benefits of that.
By Yourself: Now in this rare circumstance - save or dies are actually quite good. However - avoid this situation like the plague. If you choose to test your "phenomenal cosmic power" by going out alone, then YOU are the Big Stupid Fighter, except you aren't Big, you aren't a Fighter, and you're not....well, that's it pretty much.
- Treantmonk's Guide To Pathfinder Wizards, 2009
Wizards in this version of Golarion prep more Save or Die than you'll find advised by the Pathfinder char-op community.
It's not that the author disagrees with the char-op consensus, nor that they write wizards too dumb to come to the same convergent answers. For example, wizards in this Golarion use less evocation than in Paizo's Golarion (where most statted wizards are evokers), or Glowlarion-broadly-construed (where chain lightning is a spell that people ever cast).
Their reason for casting Save or Die spells are threefold: they're more likely to find themselves By Themself without a Thief, Fighter, and Cleric in tow; they're less likely to need to pace themselves for an adventuring day; and they don't typically care in the slightest about outshining the rest of the party.
Non-Lyvina Mayyad wizards on Golarion are playing for keeps on a level that most Pathfinder Guides will gently suggest you avoid.
But this only extends to the spells they prepare and how they cast them; unlike Player Characters they don't get to allocate their stats or decide on their feats with the sourcebooks open in front of them. Toff Ornelos had 17 starting INT, Togomor 15.
Toff Ornelos doesn't have Persistent Spell or Spell Perfection.
His rival Togomor's trap the soul is considered impressively irresistible theseaparts - Altronus would call DC 32 rookie numbers, and he'd be right, but it all the same makes some demigods nervous. (Even with his higher INT Toff can't top it.)