Chapter 26x: Night of Farewells

Objective	Boss	Units allowed	Units gained
Seize the Throne	Sonia	14	Jaffar
Items droped by emeny	Items that you can steal from enemy		Chest/Village
Fell Contract	Mine, Antitoxin, Blue Gem, Red Gem, Angelic Robe		Speedwings, Thor's Ire, Recover, Fenrir
Initial Enemy		Reinforcements
6 Wyvern Rider, 5 Pirate, 2 Wyvern Lord, 1 Mage, 1 Mercenary, 1 Hero, 1 Monk, 1 Paladin, 1 Bishop, 1 Cavalier, 1 Druid, 1 General, 1 Myrmidon, 1 Nomad Trooper, 1 Sage, 1 Shaman, 1 Sniper		8 Cavalier, 7 Pirate, 6 Nomad, 3 Pegasus Knight, 2 Wyvern Rider, 2 Shaman, 2 Thief, 1 Mercenary

Shops:

None

For this chapter, take all the flyers and pirate you have leveled up, and bring an extra lockpick for Jaffar. And if you have a restore, bring it, because one enemy Bishop has a berserk, which will give you a big headache.
You can either wait until turn 22 when all the bridges reappear again, or move as the bridges appear and disappear as the chapter goes on. I personally like to wait. So just send any flyers to take care of the mage and sage south of where you are, and let the enemy come to you when the bridge connects part by part.
For the upper treasure chests, you can either use a flyer or pirate and carry your thief or Jaffar to the small platform, or wait until turn 30 when the bridge between the platforms appear. Don't worry about the thief because he'll just disappear after he shows up. Also, make sure your thief has enough space in his inventory because Merlinus is not with you, so you'll have to drop items if you have to many.

Boss Strategy:
Compare to Sonia's resistance, she has less defance, so first move a high resistance unit close to her so that she can waste the bolting on that unit, then surround her with your strong units and attack.