Note: This can only be done as Kharg. When you encounter the impostors, they will ask if you believe that they are the real Deikbeck. Even though their names are spelled slightly different, do not believe them and choose the second answer. The first impostor is located in Parenz Ruins, while looking for the three materials required for the Tele-Op. You can find the impostor in the middle left corner of the area behind a large metal wall. You will get a Shadow Talisman. The second impostor is located in Peisus library. Once you have obtained the Lamda Sutra and have gone out, go back to the library. Go into the place where you got the Lamba Sutra and meet the second impostor. Tell him that you do not believe him and he will give you a quiz. Answer ten questions correctly and you will get a Spirit Amulet. Answer at least one correctly and you will get a Neuro Charge (can be bought in a shop inside the Flying Fortress) for your airship. The ten answers to the questionnaire from the Diekbeck imposter in the Library are as follows:

Counterclockwise
A Cat
Beautiful Stones
Palkia
How Much To Spend On the Entrants' Lunches
A Pair of Dice
The Shinobi Gang
Lakelta Deimos
A Pipe
Buster

You will get a Diek Screw (makes Diekbeck very fast) if you answer less than five correctly, a Neutrino Chage (for Airship) and Clivis's Book (rids player of all abnormal status) if you answer between five and ten, and the Spirit Amulet (blocks Fire, Wind, Water, Earth, and Light attacks for Kharg to equip) if you answer all ten.