Haha, I feel like playing guessing game. So, my ideas about this enemy that we're about to discover, who's, supposelly, a bigger treat than Sarn and Nihaz...
1. Veronika Gipatsky (Klavdia Kalugina)
We could clearly see how she got stronger and stronger with every update. Maybe all that made her go insane or something? The thing is, Allods has this habit of giving you a very strong NPC mentor that helps you destroy a very dangerous enemy (such as Soliskar the Wise killing Gorluxor for us, Nihaz, the wormfaces and the draconids helping in the fight against the demons etc.), then in a sudden plot twist, they become your arch -nemessis and you have to defeat them alone.
2. The Empire (from the future)
This would really be the most epic one

Say, decades or centuries from now, the Empire wins the war. They envolve a lot as a nation, they discover new technology and so on and so forth. For whatever reason, they have to come back in time (we have seen that they developed a prototype of a time machine, but it is destoryed by our characters). Maybe to make sure they will also win in this timeline or destroy some sort of "evil from the past". Note that, since Allods loves twisting things up, "Empire" might very well be changed to "League". Imagine Kania winning the war,enslaving arisen sciencists in order to use their genius, then transforming all xadaganians and orcs into creepy machines that would serve the League races. That would explain that Tep-themed druid slave with a xadaganian touch.
3.Our very own characters (also from the future)
This is unlikely and, honestly, I would much rather have option 2. However, this could also make a good story. Imagine our heroes becoming corrupted and dangerous in the future. Or even the gods creating some kind of clone of each person that has the sole purpose of destroying them. This is plausible, because of all these weird description of the villain, "the greatest enemy you will ever meet" nd, metaphorically speaking, you might very well be your biggest enemy
4.Sarn that managed to break out of his chains
It's weird how the game never showed us the real powers of Sarn. Every fight with him followed that "you only won because he can't use his
real powers" cliché. We could finally get to see the "better" world he's talking about. That sounds fair enough, considering the name of the update.
What do you guys think?