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Okay, so I played for the first month, and without any major problems, I defeated the arriving knight. I killed all the red units, except for the squad on the island. Honestly, it seems a bit poorly designed – as I understand it, to build a shipyard, you need to make peace with all the orcs, but I think defeating the cyclops + the guy with the wyverns and still being combat-ready to attack the knight is quite questionable. Otherwise, there aren't any particular difficulties. Also, for visual convenience, the orc quests could be separated into their own category, as there's a problem with displaying the hints, showing who needs what.
Added 1 hour 5 minutes ago
Besides, the one-month limit is only for the clearing quest. Still, I think I'll need to sort out the quest descriptions later