Get defensive ones, like Marcus, Oberon or Mira. These are less likely to commint early reckless attacks. Korvek is defensive too, though not strong enough.

Finally beat this one, with several tries, several hours of play, and a couple hundred generated Sentinals. One odd thing I noticed is that I had to keep droppig workers on my Vaults, and they would then generate full gold piles from the small piles sitting around. The tiles seemed to be keeping more than their limit, but not showing the total until the workers moved the gold around. Once again, I'd like some advice as to how to keep the 3 AIs alive longer, so they could at least decimate the enemy troops. One other weird thing- some of my minions ended up floating over the chasms, and could not be retrieved at all.

Re-applied inhibitor bug fix. Replaced Empire AI personalitiy with more defensive one.

Re-updated 5 tiles door. Should be working now.

Minor bridge fix. Replaced Empire's Portculis doors with large 5 tile door, this should solve issue with Empire being unable to respond to attack.

Slightly increased corner area land so AI players can build rooms there.

Added Midas Doors near core for greater protection.

Replaced AI personality with more Aggressive one.

Added Artifacts to Empire. Added ways for Empire to breach player.

Added starter units to Empire and 4 Underworld Portals. Added extra lair to prevent overcrowd issue.