A Master, 5 Students, and Revenge 
Revenge is what the Master needs to attain. He took them in, gave his all in training them, but all were utter disappointments. They were a waste of resources and precious time. But, out of the blue, beneficiaries he held dear reached out, he agreed to shelter their child as they moved their settlement to the Royal Capital. 
'Him,' he decided, 'he will have to be my saving grace.' He would place all his efforts on him and have him be the one to achieve his lifelong wish. However... would it all work out as he intended, even after all his previous failures? The most glaring fact was that the lad had no combat experience to speak of. No drive to gain what many would kill to learn. His most threatening aspect could be the constant improvement of his toothy attitude.
Gin, the sorry sod, has no idea of his oncoming turmoils.
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