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In the actual game, the Enchanted Ballista is truly fantastic. Firstly, because the chance of obtaining it is only 2% (although you can spend 200,000 gold on a mentor), and secondly, it's completely unnecessary for a green-skinned creature. Even if an elf receives it, it's clearly not a skill for the endgame. If you're developing the Ballista as a secondary hero, it's for rushing and causing trouble on the map. For Wing, in addition to attack against the undead, he needs Light, defense, and Lore with Quick Mind, or you can exchange it for something else; the rest is a matter of preference!
And in the original game, the Enchanted Ballista isn't very effective with its low HP. However, in the TE mod, it's at least tied to magic and has 2000 HP. By the way, in this mod, Wing starts with leadership. :D
Regarding the combination of Empathy and Lionheart: I haven't tested it, but it seems like it won't work. As an example, I'll mention (although it's not directly analogous in this case, but it highlights the mistakes and bugs of Nival in Heroes) that Quick Mind doesn't combine with Krag's ability.
Regarding the absurdity of both builds: I haven't even watched them. It's already clear that the players who presented them are essentially playing completely different games and are basing their development on completely different assumptions. Arguing here, saying "you don't understand the game," is simply pointless for the reason I mentioned. For example, I can't understand how someone can develop their hero for 6 months, for example, up to level 35. Because, in theory, there's no difference between a hero at level 27 and a hero at level 67. But it's not my business; people play however they want. I'm just trying to explain that each player plays the game they want and how they want.