Black Sword Knights

Black Sword Knights is a guild in Elder Tale lead by Isaac that only accepts members that are level 85 or higher.

Overview
Black Sword Knights is a guild founded by Black Sword Isaac. Known for being elitist and considered as a pure blooded battle guild, it has the policy of only accepting members that are level 85 or higher. Due to this policy that they upheld even after the Apocalypse, potential members are limited, making it possible for rival guilds like D.D.D to overtake them.

After the Apocalypse and in order to keep up with their competition, the guild buys low-level players' EXP Holy Water from Hamelin in order to help them breach the level cap. However, these transactions stopped after the formation of the Round Table Alliance, an alliance of guilds wherein Black Sword Knights is a member, and the dissolution of Hamelin.

The Black Sword Knights mainly consist of male players, as several members complain to Soujiro about the dearth of female players on their team and the departure of most of their female players from their guild -- only to learn that most of said female players had asked to join the West Wind Brigade. It is unknown whether or not Isaac sees female players as "inferior" which explains the lack of them within the Black Sword Knights, as he tells the two members that he "doesn't need no girls that can't keep up with [them]."

During the Summer Training Camp held by the Round Table Alliance, several members, including Rezarick, attend. Most of the members go to Sand Leaf, and Rezarick goes with Nyanta and Naotsugu to Ragranda Forest.

Strength
Though considered arrogant by some, Black Sword Knights is undeniably one of the top battle guilds in Akihabara. However, due to their entry restriction, their members are considerably fewer in number compared to other top battle guilds. With this in mind, the guild decided to focus on quality over quantity. Namely, this involved increasing the level of their current membership above the previous 90 maximum level cap. To this end, they utilized low-level player's EXP pots, which they bought from Hamelin.