So I gave this a shot.
Every unit that was enabled for additional factions-Teleri units for Ered Luin, trolls and dwarven units for Mordor-are silver surfers. I suggest reading the tutorial how to fix it here: https://www.twcenter.net/forums/show...nother-faction
The battle when taking a "good" choice. First, I suggest replacing the dwarven catapults with Mordor ballistae and catapults. The gates of Thorin's Halls are small and set deep within stone arch. Dwarven catapults use high ballistic trajectory and tend to hit the arch way more often than the gate. In fact, in my game they exhausted their ammunition without even hitting the gates once. As a result, the battle ended without casualties on either side, and the Mordor army is eliminated. The Mordor artillery fires over flatter arc and has better chance of hitting the gates.
Elven assistance will plunge EL deep into debt. Those units are expensive to keep. I suggest to remove one ship from the fleet-it's still the most powerful fleet on map north of Dol Amroth.
Realistically, the player has only two options. Fight now, or consolidate troops for counterattack. Moving elsewhere is impossible, you'll be 100k in debt before you do so. It would be helpful if the assistance came a turn before Mordor attack, so the troops could be used in defense.
Any progress?
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Erasiel Darkar is OP! Never will be nerfed! He is Winx