No new characters in this chapter.
Make sure your best magic user has the Starlight spell.
Now, there are a lot of Garnef clones in this map. Here is the real Garnef:
You can tell who is the real one because he has the Falchion in his inventory.
There are some magic users near your starting position, kill them with your best ranged attacks (you can’t kill some of them with melee attacks because of the walls).
There are 2 snipers, too, but they shouldn’t be much of a problem. Get the treasure as fast as possible and approach the center of the room; where you should lure the heroes. Just make sure you are not inside Garnef’s attack range yet.
Once the heroes are dead, it’s time to face Garnef. Have your starlight user stand here (use a pure water if you wish):
Garnef will attack you, and he should die in 2 or 3 hits.
Hurry up, because reinforcements will start coming from the far left and right sides of the map.
Once Garnef is dead, hurry up and go north. Be careful with the Generals and snipers, as they carry silver weapons.
If you don’t have Starlight, your best option is to warp Marth near the throne and kill the Garnef clone standing in the throne, then seize.