But the problem is, Murin knew very well that it would take him a long time to reach the stage where he could command a large number of rank 7 magic beasts.
So…
Murin never used it again.
He only used it to attract some specific magic beast when there were not many other magic beasts around. After that, he would sign contract with the powerful magic beast, further strengthening his strength.
It would have been better to use infants or young magic beasts to make the bond stronger.
But Murin didn't have that much time.
He couldn't possibly find weak and ignorant magic beast to be his contract magic beast.
So he could only take the risk and signed contract with stronger magic beast. Relying on the force control from the flute of beast, Murin was able to establish the contract and become a powerful magic beast.
Afterwards, he would nurture the bond slowly but surely.
