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I've been playing Heroes since the very first installment, and I've been playing the third game for 9 years now:smile17:
I can offer a cool tactic that works well with all factions, although "Conflux" can be a bit challenging.
Faction: "Dungeon", Hero: "Deis"
Hero skills: Tactics, Attack, Wisdom, Earth Magic, Air Magic, Logistics - the last one depends on luck; if lucky, Diplomacy, otherwise, Defense.
Development: Town Hall, Mage Guild, Marketplace, Forge, City Hall, Harpies, Eyes, Snakes, Minotaurs, Manticores, Stronghold, Castle, Capitol, Resource Hoard, Mage Guild 2, Dragons, Artifact Marketplace (if you have a lot of money, you can skip the Capitol and build Dragons in the second week).
Considering the hero's specialization, the main goal is to level up quickly. To do this, first, buy 2 heroes and use a combined army to cause minor disturbances, then buy archers of the 2nd tier, and in the 3rd week, buy more archers and start attacking stronger monsters. In the Artifact Marketplace, buy Boots of Swiftness and Gloves; the rest is secondary and can be found. Gradually replace Tragladiators and Harpies with Angels and Wyverns from neutral dwellings and hoards (don't forget about morale; you need to buy or find artifacts that give +2 to morale).
Final battle: If there aren't too many skeletons, less than 1500, confidently move Wyverns, Angels, Dragons, and Minotaurs forward using the Tactics skill.
We start first, then a massive run and attack follows in this order: Angels = Skeletons, Dragons = Skeletons, Minotaurs = Skeletons, Wyverns = Liches, Manticores = Liches, Archers attack depending on the situation, but the Undead no longer have archers or skeletons, and after that, it's just a matter of technique