Yesterday Evening,
'Huh, man! This is so freaking hard to guess. Just what should I use as my trump card? Normally, the trump card is something that can significantly increase my chances to win over the situation that I will be facing in the future.'
'Strength! Normally, those situations will occur when I will need an extra pound of strength. But, what exactly can give me the strength. I can't possibly improve my muscles or bones since I can't use dragon blood.'
'Wait a minute, I am lacking stamina and intelligence from my status. But both of them can't be increased right now. If I run out of ability energy and stamina, that would be a disastrous situation. Hmm! I can certainly use an overload of ability energy to finish the battle quickly.'