This is the final mission. Tastidian tells you to go to the Psy Academy to ensure that it won't side with the Spriggats. Once you meet and talk to Piter, you regain all your memories and become exhausted. Once you fall asleep in your room, a man named Dean Lukas will be in front of you and ask you whether you want to side with the Psy Academy or with Tastidian.
The below is the walkthrough for each path:
1) Siding with The Academy[]
(Recommended Orbs: Green and Black)
This is the canonical ending, where you must seek to kill the Shadowling Queen, Nelis. This is extremely difficult, so it would be wise to train as hard as you can. Once you feel you are ready, go to Somnus, where you must face Tastidian. The first battle you have is with lots of Shadowling Soldiers and two Shadowling Guardians. The soldiers are pretty difficult to beat, but cornering them could help. You should try to take out the guardians as quickly as you can, because they are capable of doing massive damage. The Black orb will absorb good amounts of dark energy from the enemies.
Once you've beaten them, you now have to fight Tastidian. He seems to have infinite health, but he doesn't. There is a bunch of shadowlings protecting him; first priority, take these out first. Once you 've done that, retreat, if you must, to heal yourself. Ultimately, you need to consistently deal damage to Tastidian, because he heals every turn. His attack makes this pretty difficult to accomplish, since it deals high damage to all units surrounding him. An effective tactic is to send Darkling and Shadowboxer to capture the squares on the left and on the right of Tastidian respectively, for they have Shadow Resistance to protect themselves against Shockwave. Meanwhile, the player gets behind his healer and attacks Tastidian with Pyro Blast or Vengeance. Keep attacking with your troops, and he will eventually fall within a few turns.
The third battle isn't nearly as hard as the last one. It only has some Phantom Armors and Energy Golems. If you have Darkling, a good idea would be to shadowport behind enemies and attack them for backstab damage. Area-of-effect attacks are also helpful. The next battle won't be as easy...
Fighting the Queen[]
It easy to lose members here. A lot of members. Nelis is very fierce, and it doesn't help that there are energy golems and phantom armors protecting her. First off, destroy the energy golems, and then take out the phantom armors. While doing this, try not to get attacked by Nelis, as both of her attacks are very effective.
Once dealt with the other units, get your highest damaging units against Nelis. Try to deal backstab damage with Pyro Blast -- the Green orb provides good movement speed. On Brutal, Nelis deals 64 normal damage with Holy Blast on her target, plus 6 damage on the rest of your team, so make sure that your troops have enough health to survive. The white orb may fail to protect you against Holy Blast due to a glitch appearing randomly, so be careful.
Additional info: Nelis has about 500 HP but she also has passive regeneration.
2) Siding with Tastidian[]
(Recommended Orbs: Green and White)
If you side with Tastidian, you must fight Dean Lukas. This causes Anya and Guy to desert you. The fight that follows is extremely difficult. You must face the elite defenders of the Academy, and they get a free turn to pummel you at the very beginning. You simply need to have Festus with Big Shield on the 5th slot to heal members as soon as you start. Make it your priority to kill the psy fighter with Light Bomb, or perhaps more easily, have Darkling distract him by Shadowporting out of formation and attacking him. The white orb will certainly come in handy.
Fighting Dean Lukas[]
Dean Lukas has a high amount of health and a far-reaching, powerful Light Bomb attack. However, that is his only attack. Once you have defeated his defenders, simply pin down Dean Lukas with melee units and he won't be able to hurt you (as long as you keep your other units out of Light Bomb range).
After the Mission[]
After this mission, you have won the game. You have the choice of starting a new game+. A new game+ sets the game difficulty to the next tier. Plus, all characters in your roster will have the same stats as those when you beat the game. Finally, when you talk to Hellion about his chest, you get a hefty reward, as it contains a large amount of gold. The amount of money depends on the difficulty at which the final battle was beaten (5,000 on Easy, 12,000 on Normal, and 28,000 on Hard/Brutal).
Further Notes:
- When choosing new game+ from the Sinister Design version, Dorgon may be available from the start, but he is dead and needs to be revived.
- Also, Vengeance skill turns to Feedback again, however leveling up the skill or Psy Defense once can fix this.