I need some help / pointers on how to keep from getting overrun by Ogre Magi Chief. I can smash Barbarian by stealing my teammates bonus, but at a certain point when both I and Ogre have around 40 some odd armies, he suddenly explodes and I can't do much anymore. I try to create defensive chokepoints but they don't hold up very long and I end up losing. I've played up to almost turn 30 where I'm earning 115 armies per turn but hes at over 160 armies.

https://www.warzone.com/Forum/402816-help-priestess-psion

Do you have advice for which territories to gift to help shift my ally's focus?

If you steal your teammates bonuses you should overrun both AI within 15-17 turns...

Red never got more than 20 income when i just retried that.