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Dirael is the best! Ents, archers, readiness, and summoning magic are key. Everything else is secondary. The main goal is to take out the ballista and centaurs early. If the Orc has upgraded the ballista's attack, then the hero's attack is less dangerous. If the Orc tries to kill the archers with the hero's attack, there's the wasp swarm, which reduces the attack value of the unit linked to the Orc hero.
In general, the skill build is as follows:
1. Summoning magic: Life Master, Fire Elementals, Charm Master.
2. Defense - up to readiness.
3. Attack: Tactics (for readiness), Archery, Fire Arrows.
4. Wisdom: Magic Affinity, Graduate, Spell Mastery.
5. Logistics: Scouting, Keen Mind, Pathfinding.
The essence is simple: you need to outlast the Orcs. Ents with readiness are simply beasts: they attack twice - before and after the enemy unit's attack. Our defense is as high as it gets: elves have maximum defense, plus the defense skill, plus wisdom. But that's not enough; we also upgrade resurrection in summoning, keeping the druids alive longer. The Orcs have only one defense against resurrection and summoning - upgrading Suppress Magic. But that doesn't save them - we have wisdom and druids. In the end, we might have only a few ents left, and that will be enough, because we also have fire elementals, the ballista's fire arrow, and resurrection.
The most important thing is to destroy everything that shoots as quickly as possible and keep the archers and druids alive as long as possible. Dragons, unicorns, and dancers are just meat, their task is to protect the archers and druids. They need to be used to destroy the ballista and centaurs. The latter, by the way, are quite tough and won't be able to hide, as we have tactics, and the enemy won't be able to position themselves effectively.
And when the job is done, you can always run back or even defend directly in front of the enemy, because we have readiness and good movement range.
We take artifacts for defense and knowledge. The druids will convert this knowledge into magic anyway.
In general, I don't know how to play as Orcs against Dirael with these skills. Maybe someone can explain where the Orcs have a chance here? :)
And forget about this Wing, he's weak!