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Since winning tactics have been discussed here, I'm posting my walkthrough. After the preliminary results, maybe we can demand some from others.
Castle.
First three days: gargoyle upgrade - level 1 guild - level 2 guild.
Nura.
Arms herself with 63 gremlins. Runs to the crypt, -2 gremlins; then skeletons - clear, touches the stable;
beats the elves, -4 gremlins, picks up everything on the ground. Upon reaching level 2, she prioritizes the Wizard's Mark (indispensable!). Then she fights through to the mine, -2 gremlins; takes the mine and all the ore. Then the castle (learn ship summoning), the tree near the sawmill, the shore by Marletto's tower. There, using the remainder of the 4th day's move, she summons a boat and boards it. Next, Nura's goal is to land near the elf in two trips. However, this is easy to do if you sail around the first islet from the galley side, rather than the sirens'. In the elf's lands, Nura, grabbing money from a chest along the way, heads straight for the castle. On the night from Sunday to Monday, she fends off Gilraen and, preserving 42 gremlins, enters the green castle without resistance.
Deleb.
Taking 31 blue gargoyles under his banner in addition to his 17 imps and 10 demons, he heads toward the knights at the factory, where he loses two imps. To the sawmill, fairies - clear. Level 2 - Tent (!). To the djinns - clear; to the druids, losses - three imps and two gargoyles. Level 3 - (hooray!) Ballista, +1 defense, money from the chest. And now ahead is the shipyard surrounded by water elementals. Losses - 4 imps (Fire Ballista solves it!). Level 4 - Cursed Mark (will be useful). The remainder of the third day is spent building a ship and boarding it. However, before sailing on the morning of the fourth day, twenty-three gargoyles are transferred to Ora's command. Three days of sailing, with a break to loot the galleon wreck (no losses), bring the knight's ring and some money. On the night of the 7th day, Deleb repels Faiza's attack, losing 1 imp. In the morning, he crushes Hafiz's troops. In a long and brutal battle, only one imp and five demons survive. But that no longer matters - the mage is now without troops, Ossir is not dangerous. Gaining 500 exp from a chest along the way, Deleb easily takes the castle. Yellow is dead. Only the sword remains to be collected. Result - level 8, stats 12-3-4-3.
Ora.
Hired on the second day. With an army of 5 gremlins, she runs past the sulfur deposits to the dolmen, where she loses three gremlins but reaches level 2. Having mastered the Wizard's Mark (which is essential), she accepts 23 gargoyles from Deleb, builds a ship for Nura, and then one for herself. The evening of the 4th day is spent boarding the ship; then she sails to the warlock. There, picking up a pile of gold, she takes mercury from the alchemy laboratory. On the night of the 7th day, Erin arrives, wipes out the elves, but does not attack (doesn't have time), while Vaishan manages to attack, resulting in the loss of one gremlin and three gargoyles. However, Ora reaches level 3 and chooses Luck. The main thing in the battle with Erin is to have full mana; therefore, Ora, having taken the mercury, heads to the well, and then for the crystals. Erin attacks at night. Wizard's Mark, 30 mana, and a bit of luck - victory, though only 4 gargoyles survived. But even that is more than enough to take the castle. Thus, blue dies on the 8th day.
Nazir.
Sawmill - garden of the fair folk - tree north of the castle - money behind the castle - mercury at the castle - factory (hires 2 trees and 200 gold for ships) - mercury at the alchemy laboratory - (at the end of the 7th day) into the castle. On Monday morning, he buys 1 gargoyle in the castle and wipes out the knights guarding the sword, losing a golem, and picks up the chests.
RavEnna.
Hired on the sixth day, she runs to the campfire in the center, then to the sword. As soon as Nazir clears the path, she takes the sword and gold, runs to the factory to get mercury, and then attacks the gargoyles at the dolmen and escapes. She is hired in the mage's lower castle and gives the sword to Deleb.
Narkhiz.
Hired from the elf on Monday, he takes all gremlins, gargoyles, elves, unicorns, and the fairy into his company. Kills Dirael. Victory.