This scenario becomes quite difficult, as there gets to be a lot of people all concentrated into a small area. You also need to work quite fast, which is always a pain - I prefer to take my own time.

Each of the black blocks are separate rooms. Sending a unit or general inside will switch on the lights, revealing whether or not there's a chest inside. If there is, head over to the chest and open it, and you will recieve the item. If an enemy general does this, you must kill that General to get the item. The most important is Langrisser. Omega's tough enough as it is, but once he recieves Langrisser, he becomes much more powerful.

But there's always a way. When the flying groups come from behind, make sure you have at least one spellcaster - Whip them up a bit with Tornado, and finish the job with archers. Also, use archers against Omega - you really don't want to get into close combat with him. There are no secret tiles, but the chests contain Langrisser, a Sonic Band, a Runestone, a Tiara and a Crown - all very powerful, expensive items. Make sure you pick them up - if you want to know their locations, then highlight the text in black in the boxes below: