Naturally, Aleron didn't waste time just observing the ongoing battle. He was also digging deeper into the mastery of space and time while occasionally giving support to his side on the battlefield.
Instead of comprehending a second Concept, he had decided to reach 2nd level in the Astral Reaver concept first because the difference between 1st level Concept and 2nd level concept was massive, to say the least.
The major benefit of a 2nd level Concept was a reduction of soul energy when utilizing the Concept's power. The reduction was massive 90% in the 2nd level, not to mention the increased potency of the skills that utilized a 2nd level Concept.
'Graystar was 23rd rank, and he didn't have a 2nd level concept, but I have to assume that the top 20 must have a 2nd level concept.'