'Things are going to break apart soon... They will if I don't do anything to prevent it to happen.'
Hera squinted her eyes slightly as she looked at the battlefield. If they kept going in the same way they were taking from the start, that battle was bound to end in a dissatisfying way.
Lancelot was doing his best to maintain his force field, but it was not so simple. He was an elder, his prime was gone long ago, and Mana Crystals wouldn't help him forever. He already pushed himself far beyond his limits and only God knows how much harm he would get in his body for doing so.
A Mystical Artist's life is quite short. They can only fight to their limits during their prime or youth times. After that, they are bound to get weaker and weaker, until they are completely useless.