Arthur didn't hurry to kill them as he knew his dragomancer technique wasn't flawless. Yes the dragons would retain some of their old memories, but they still remain only scattered pieces and small fragments.
"We won't tell you anything."
One of the group replied in extreme arrogance and determination that made Arthur sigh. 'Is there a way to force them to speak?' he asked his three beings inside his mind.
'As far as I know there was once a potion for that, but I don't know the formula for it,' the golden dragon was the first to let him down.
'I know nothing as well,' Gege said.
'Ding! There is a technique but it requires a high level of mine to be unlocked,' the system said.
'Can't you unlock it for me?'
'Ding! Sigh, I can't. not every technique is possible to be used or else why are there many levels in your evolution path?'