Even though highly concentrated mana had various benefits like quick activation or less stress on the mind, those effects were minor at the end of the day.
But after crossing the mark of 80 percent concentration, the mana would transform completely. That was why it was given a completely different name of Aether.
Aether was extremely useful for any magus. This was straight up a superior version of the mana. If two similar spells faced one another with one of the spells being powered up by Aether, then that spell was going to overcome the other one without some sort of special circumstances.
Not only that but Aether gave no stress to the body of the spell caster. So someone using Aether was able to continue fighting and practicing magic for a longer period of time. Which was a bigger deal than it sounded.
