The Wind's Sword Realm was a Sword Realm with wind element, and would require a deep understanding of the wind profound. On the other hand, the Thunder Sword Realm was based on the thunder element, but required even more in terms of the thunder profound. If the profound did not reach its standard, then the thunder realm would have a lot of flaws, and its power would not reach its limit.
Even the Sword Realm Artist did not know where the limit of the Thunder Sword Realm attack lay. If he wanted to push his Thunder Sword Realm to its limit, then the thunder profound would need to reach full completion. However, he had only understood ninety percent of it. Of course, he had improved a lot since ten years ago, when he was only at seventy percent.
