Once he had examined the dark mana carefully, Jason had learned it was almost an identical copy of his mana.
The only difference was that the mana used by his clone contained tiny particles of divine energy.
This particles of divine energy belonged to Veritas and Cerberus who were responsible for summoning the clones.
It was their power which was being used to keep the clones alive and functioning. The mana inside them also came from the divine energy being supplied to them.
After confirming things with the system, Jason realized that since the mana was similar to his own mana, he could initially use it on himself.
That was the reason he was able to suck the two thunder dragons inside him. The pain had been caused by the divine particles which didn't want to enter his body.
But after putting enough force and pressure into them, Jason ended up absorbing both the mana and the divine particles.
