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XEL - the question is, in which parts does the action take place on Enroth, and in which on Xeen? Regarding the recovery after the cataclysm, this is quite possible: nowhere does it say that the explosion engulfed the entire planet; remote lands could have survived, there are fewer cataclysms in the dungeons, and some races could have gone through portals and then returned. Regarding the recovery - the cataclysm is magical, which means its consequences are unknown, and how it will develop is also unknown; besides, there are gods, the Guardian. All this justifies the relatively rapid new development of the continents.
The option with a ruler-Guardian is good, but is it appropriate for the Elves? I think, at the request of the players, I will create some race with a Guardian, but not the Elves, otherwise I will have to redo too much. For the Elves, it should be a recognizable druid character. I am replacing Tiviona with Elrich Parson.
Muga - the weaves are something like tree-like structures, brought to life by magic. Inside, an archer can be placed, thus creating a piece of forest with an archer inside.
Beorn - forest werewolves that transform into bears, they are engaged in beekeeping and growing fruits, and also practice healing.
Gamehunter - it turns out that three new units appear for Rampart, many additions for the triple upgrade, level 8, commanders, defender.
By the way, which name is better, Aquilon or Land of Eternal Forests?