Thank you for the congratulations, gentlemen!
Here is my walkthrough. I will upload the most interesting replays (Nimus, level 3, with 3 Imps against 16 Death Harbingers; Grok, around level 10, with two Imps against 3 stacks - 13 Ents; and, of course, the Outpost) a little later (in half an hour or an hour).
You can reach the opponent in different ways... But all outposts open only on the 23rd day, except for one - the sea outpost. The question of the route is no longer relevant :) And our global task of destroying the opponent has turned into a local one - breaking through the garrison. The composition of the garrison that goes into battle consists of 5 "thick" stacks: 2 stacks of 20 Undead and 3 stacks of 10 Water Elementals (by the way, this is a mistake by the map author, because two stacks of Vampire Princes simply wouldn't fit on the tactical map at the start of the battle).
I assumed that it would be easiest to break through with a hero who definitely has Battle Protection, Regeneration (Skilled Light Magic), and mana regeneration during the battle. And, of course, this hero must be fast (Logistics) from the start, and since Necromancers are forbidden, here is our hero - Grok!
And here is the nearest Witch Hut, which is near the castle - what's there? Basic Defense! And in the neighboring ones, which can be reached through portals? More Defense and the Light magic we need.
Now we can start...
Day 1.
Inga, collecting chests for money, goes to the Dungeon, to the stables. And Nimus, who is to perform a small feat tomorrow, rushes to the Teleport (+1 level at the Shrine of Knowledge, Basic Logistics). After all, we must not forget that we still need to get the Regeneration spell, which is in the second castle... and in the Temple of Magic, guarded by Stone Golems. And Svee is destined to be the hero who actually digs...
Day 2.
So, in the Tavern, Grok has arrived. He ended the day a step away from the very top teleport. Near his castle, he destroyed everyone except the Imps - they are still related creatures :)
Level 6 (Advanced Gate: Soul Eater, Hellfire; Advanced Logistics: Find Path, Path of War).
Nimus, level 3 (another Shrine of Knowledge), successfully defeats 16 Death Harbingers, who guarded the Club of the Cannibal. This battle was fought to gain experience in the battle for Regeneration, plus Advanced Logistics was obtained - it was simply necessary to transfer troops back to Grok.
Day 3.
Nimus, level 5, defeats 151 Stone Golems, losing 6 Demons, 2 Imps, 13 Warriors, and 4 Spearman. He has 65 Warriors and 29 Spearman left. But now he has Regeneration :)
Grok ends his journey on day 3 where he started. But during this time, he managed to defeat Swordsmen, Archers, Death Dancers, and Swordsmen again, which are near the very top teleport. And he acquired a supply cart. He returned to the second teleport, Centaurs, Witch Hut (Basic Defense), Crypt, Obsidian Golems, Scouts, Shrine of Knowledge, and teleport.
Level 10 (Skilled Gate: Soul Eater, Hellfire; Skilled Logistics: Find Path, Path of War, Plunder; Basic Defense: Dodge).
Day 4.
Grok went to the lower teleport for Basic Light Magic. Then to the middle teleport and earned a little experience - Ents, Zealots, Well, Minotaurs, Zealots, Ghosts, Lizardmen, and all the good stuff that follows them. And then the day ended.
Level 13 (Skilled Gate: Soul Eater, Hellfire, Curse; Skilled Logistics: Find Path, Path of War, Plunder; Advanced Defense: Dodge; Strong Light Magic).
Day 5.
Well, then to the shipyard, defeating everyone you can (except for Phoenixes) and using Shattered Banner and Oasis correctly.
Level 16 (Skilled Gate: Soul Eater, Hellfire, Curse; Skilled Logistics: Find Path, Path of War, Plunder; Skilled Defense: Dodge, Last Stand; Skilled Light Magic). Grok ends the day far out at sea, near the Sunken Temple, of course, placing a flag on the Lighthouse.
Day 6.
After the Temple, the level remained the same. On board were 4 Bone Throwers, 1 Imp, 9 Spearman (all of them were killed in the battle with Vampires on the shore), 1 Hydra from the Mercenary Camp, and 38 Warriors. He went to the garrison with 2+2 Bone Throwers and 2+2+5 Spearman. He dismissed the Imp. He broke through, jumped into the teleport, and dropped anchor near the second Abandoned Castle.
It seems that the level doesn't matter anymore.
Day 7.
He landed on the island, jumped through the teleport to the mainland, and reached almost the teleport to the opponent's location. Along the way, he defeated the opponent's main hero, so that I had only 4 Warriors left, then the computer didn't run away from me, but, on the contrary, tried to attack.
Day 8.
He bypassed the opponent's last hero, captured an empty castle, and sold all the artifacts that do not affect the hero's parameters. He exchanged everything for mercury :) And then he went with the newly purchased army to the opponent's last hero.
That's all ;)
Here are the promised replays:
http://files.wyw.ru/wyw_file?id=4199917