Hello!
In the upcoming Lineage II update, Salvation - First Chapter, there will be a major restructure to clans.
Knight Units and the Academies will be disbanded, any character in these groups will be automatically removed from clans when the update is applied.
In order to prepare for the update, we recommend for clan leaders to remove inactive members from a clan and move as many active members to the main clan or Guard Units before the update is live.
Existing Clans that are already level 11 will also have less members slots available initially with the removal of the sub units system. However, 200 Members can be unlocked again by increasing a clan level to 15.
Thank You!