Would be a treat if there were bonuses to be had from the other planes. Such as getting kings under the mountain by recruiting from Pedoseion' citidel in Agartha. Or knick the dwarves of the four corners from dominions and make them available from the elemental planes. Setting up a dwarf hold in Kokytos was a hoot but there really wasn't that much to gain from it for the effort, you can't even upgrade your freespawn workers down there.

There's only so much that can be done with CoE modding.

Master Rune of Sanctuary is not working at all and Grandmaster Rune of Adamant loses its effect on next turn.

Kinda sad that bonuses does not stack. Instead of effecting whole army Rune Lord bonuses could effect certain amount of units but they would be permanent. Being able to stack and keep the bonuses would be a breeze for late game imho. I have all other races are modded as well as extra races so end game for me is little bit wacky :P