Posts from Which unique secondary skills are best for heroes?

What is "Arcane Wave"?

I chose something useful for each faction. I just couldn't find anything worthwhile for the Elves...(((

For the Elves, Enchanted Arrow is good; it's both a spell and an arrow. You can also use Deadly Shot, but only against a unit listed as a sworn enemy. For example, you can target a Lava Dragon with 280 HP, and there's a guarantee it will be destroyed. You can also get experience from arrows if there are sworn enemies.
For the Wizards, Magic Mirror and Wizard's Sign are useful. Artifact Absorption helps when you have few troops left.
For the Demons,
Soul Eater is good when you run out of mana, and it's also beneficial because it removes creatures from the battlefield, preventing them from being resurrected or raised as undead.
Hellfire is good on its own, but it consumes mana, which can be
restored with Soul Eater.
For the Knights
Prayer is useful because the Knight's strength lies in their army.
Vigil is good because the hero escapes and gets to attack again for free.
Warlord is useful if you focus on training, which is especially relevant because after patch 2.1, you have to retrain high-level creatures.
For the Necromancer
Eternal Slavery
The Necromancer's strength lies in numbers, so this skill is important.
Spiritual Link is needed because the Necromancer doesn't have a huge mana pool.
Banshee's Cry can be used to prevent the enemy from getting many turns with high morale.
For the Warlock
Arcane Waves to quickly destroy the enemy.
Sense Magic provides a small bonus to damage from spells and creatures.
Dark Ritual, I rarely use it because it's a waste to spend a turn restoring mana, but when you're waiting for a siege on your castle and you're out of mana, it helps.
For the Dwarves
Perfected Rune, naturally, to make the rune cheaper.
Reforged can be used because a lot of resources are spent later.

I liked the archer buff for Necromancers. Of course, it's not as good as the Lich buff in Heroes of Might and Magic III (when you get the Lich's Cloak), but it's still decent, especially with the Clone spell.
I also liked Hellfire – it helps to alleviate the unpleasant impression of Inferno somewhat.
Arcane Wave is also not bad for Dungeon, but I didn't use Dark Ritual at all.

I haven't played the add-ons yet and don't know about the abilities of the Dwarves.

The message shows that you haven't played the game :) because in patch 2.1, the Necromancer ability "Raise Archers" is no longer available.
But I like the new Necromancer ability "Necromancer's Mark".

I liked the "Raise Archers" ability for Necromancers. Of course, it's not as good as raising liches in Heroes of Might and Magic III (when you get the Lich's Cloak), but it's still decent (especially with the Clone spell).
I also liked Hellfire - it at least helps to alleviate the unpleasant impression of Inferno.
Arcane Waves are also not bad for dungeons, but I didn't use Dark Ritual at all.

I haven't played the expansions yet and don't know about the abilities of the Dwarves.