Capítulo 412: 7.06.4 Beetle attack.

"Drag the truth out of him on your own and don't depend on me for it." 

Deimos was going to use this Prince named Ludwig as a test for Amir. 

His grandson might be exceptional in many aspects, but where he loses is the interpersonal relationship, and lacks any worthwhile subordinates that can do his bidding. And as it's in the Royal family, It's not always the Knights of other noble families that can become your subordinates, but even your own blood can be recruited.

It's a sign of capability and as it stands, no one in this world can fight on their own. You need to look for help, make alliances and even destroy others in the pursuit of your goal if some simpletons dared to stop you.