Scenario 26 "The Black Dragon Sorceror's Trap" Winning condition: -Death of Egbert Losing condition: -Death of Elwin Items: War hammer, Great sword, Wand, Longbow, Arbalest, Chain mail, Plate armor, Cross, Necklace, Orb, Speed boots, Amulet. Heroes: All Enemies: Left tower: Imperial General Archmage L5 Orb, Ballista x2, Dark Elf x4 Imperial General Wizard L7 Orb, Armored Soldier x4, Ballista x2 Imperial General Saint L10 Armored Soldier x4, Heavy Horseman x2 Center tower: Imperial General Archmage L5 Orb, Ballista x4, Dark Elf x2 Imperial General Archmage L7 Wand, Ballista x4, Dark Elf x2 Right tower: Imperial General Archmage L5 Orb, Ballista x2, Dark Elf x4 Imperial General Wizard L7 Orb, Armored Soldier x4, Ballista x2 Imperial General Saint L10 Armored Soldier x4, Heavy Horseman x2 Gateway: Imperial General Knight Master L10 Amulet Heavy Horseman x4, Dark Guard x2 Egbert Zarvera L10 Dark Rod, Mirage Robe, Elemental x6
You've been through scenarios like this before - you start out on low ground, and the enemies are meteor-chucking mages and ballistae behind unscaleable walls. Use the same tactics as before - hit them with ballistae and meteors of your own. Since this is the second-last scenario, you might want to ditch the 'knock down to 7' routine and just kill them outright. Either way, you will still end up getting hit. There are 6 mages sitting on the parapets, way too many for you to suppress/kill at once.
If your fighters have good magic resistance, send them ahead to attack the saints at the base of the towers and cast resist on your mages. This extends the life expectancy of your ballistae, which are very vulnerable to magic. If your fighters do not have good magic defense, buy them an amulet - you need magic defense more than you do physical defense. If you'd rather not use fighters at all, a group of ballistae under a serpent master, resist, and protection could probably wipe out all three towers. However you decide to do it, resist is very useful.
Once the towers fall silent, it's time to go after Egbert. Hit the knight master with dragoons or phalanx - you will definitely need a couple of dragoons to deal with his dark guards. Egbert's elementals aren't tougher than any of those you've already faced, his bonuses are not very good. Just be careful not to put any heroes near him until you've taken out most of the troops unless they have high stats, because the knight's dark guards are strong, and even the horsemen might cause trouble for a mage.