Collecting the robot parts from the various hidden 'segment' doors in the game will eventually lead to the discovery of ROBOT PARTS.

Collect two arms, and go to the robot academy in kukai foundtation, and talk to the proffesor. He will create for you, Shion's 1st summon monster ether move. This one is called THRONI BLADE, and costs about 16 EP. It attacks all enemies, and initially does an average of 1400 damage to all enemies on the battle screen. You can use these summon moves only once per battle.

If you take two robot legs to the Professor, you get the Dominion Tank. Also for Shion. This one takes off about 2100 off all enemies, and costs 20 EP.

If you take the robot head to the professor, you get SERAPHIM BIRD. It takes off about 3400 off every enemy on the battlefield, and costs 24 EP.

If you take the the two arms, two legs, and head, as well as the robot torso, you can make the strongest attack summon in the game, the giant robot, ERDE KAISER. Erde takes off 9999 of every enemy on the field, no matter what. It costs 60 EP, and also, as all of these moves are, is only for Shion. You cannont transfer these moves to other characters.

Also, having the angel ring item, from another segment door, makes the costs of all ether moves half of what it's supposed to be. This, with the Erde Kaiser, can topple any enemy. It's great to level up your characters in any area with Erde. Also, make sure you have plenty of Ether and Ether pack S' ready.