Rexsar
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There, the army consists of 50 dragons, 40 ents, and 300 assassins.
Meanwhile, by the time you reach the yellow player, you'll have 60+ archdevils.
Simply position them so that the dragons can't reach them in the first turn, and place a single imp in front of the dragons so that they attack it in the first turn. Then, remove the retaliation from them and attack with the devils. If you're lucky, those 50 dragons will fall immediately, because after defeating the yellow player, the hero's level will already be 25+ and the attack will be correspondingly high (especially since there are several attack boosts along the way). Naturally, you should develop the hero with skills like luck, leadership, attack, and logistics. You can choose either Darkness or Light. There is also a utopia and a treasure trove of mages on the map – you can get something like Subjugation or Berserk there.
The main thing is not to slow down. You don't even need to build a basic castle – just gather devils and head towards the yellow player. If you want, you can also take out the guards from the mines (but not the druids, they can take down a couple of devils with lightning). Capture the mines and gather resources with an additional hero. Defeat the yellow player and move on to the remaining two AI opponents. You might lose about ten devils on the garrisons due to the assassins. The remaining devils will be more than enough to defeat the AI opponents who don't have basic armies.
As an alternative, build the Guild of Mages and get the Astral Gate. Then, jump through the garrisons. I didn't build the Guild, so I can't say for sure if the Astral Gate is available on this map.
The mission can be completed in 3-4 weeks.
And kill the dragons that guard the chests – they contain 5,000 and 25,000 experience points each. You can kill them without any losses, and you'll also level up the hero.
Meanwhile, by the time you reach the yellow player, you'll have 60+ archdevils.
Simply position them so that the dragons can't reach them in the first turn, and place a single imp in front of the dragons so that they attack it in the first turn. Then, remove the retaliation from them and attack with the devils. If you're lucky, those 50 dragons will fall immediately, because after defeating the yellow player, the hero's level will already be 25+ and the attack will be correspondingly high (especially since there are several attack boosts along the way). Naturally, you should develop the hero with skills like luck, leadership, attack, and logistics. You can choose either Darkness or Light. There is also a utopia and a treasure trove of mages on the map – you can get something like Subjugation or Berserk there.
The main thing is not to slow down. You don't even need to build a basic castle – just gather devils and head towards the yellow player. If you want, you can also take out the guards from the mines (but not the druids, they can take down a couple of devils with lightning). Capture the mines and gather resources with an additional hero. Defeat the yellow player and move on to the remaining two AI opponents. You might lose about ten devils on the garrisons due to the assassins. The remaining devils will be more than enough to defeat the AI opponents who don't have basic armies.
As an alternative, build the Guild of Mages and get the Astral Gate. Then, jump through the garrisons. I didn't build the Guild, so I can't say for sure if the Astral Gate is available on this map.
The mission can be completed in 3-4 weeks.
And kill the dragons that guard the chests – they contain 5,000 and 25,000 experience points each. You can kill them without any losses, and you'll also level up the hero.