If all units were to compete Wimbledon-style...

[lauvhk]

All the defend/use ability analysis are based on player knowledge. For all Ents (both ancient and normal), the AI will never defend, use normal attack when the opposing unit is within reach and only use special when the enemy is out of reach. So while the Ancient Ent Wasp Swarm is a range attack that cannot be retaliated, the AI will never use it if you park something next to it.

(In case you have doubts, I would suggest starting a new game and play through the tutorial. The last battle involve two normal Ents in separate stack. Place your paladin in different hexes to see different actions from them.)

While Ancient Ent can defeat the Archdemon, it would be interesting to see how it deals with the Cyclops. I will leave it to the number crunching players.