@korralover mind you those 3 injure the offshoot of a great dragon with the ring infused by that great dragon's master own mana, turning it into a mana-generated fission bomb, so no that totally make sense.
also remember that just by suppressing his mana signature, MC manage to reduce his signature from 10 MAOU to 9. i want to imagine the power in that ring is at least equal to RDS-37 or Ivy Mike.