At 121, I take concentration two, and another one a couple of days later. All the bones and all the sustain died. Then it turned out that the road network was such that the opponent was cut off from most of the map, while I had plenty of roads. No one made contact on the second week; I personally didn't because Vidomina had good magic stats.
On the third week, I entered the treasure zone; there are two Dragon Utopias nearby—stats in the first, КВ and wings in the second. A couple of turns later, I hit part of their purse via the external tavern, and a surrender followed. Thanks for the game.