Official Guild Approval https://irowiki.org/wiki/Official_Guild_Approval

Official Guild Approval (Alt: Approval) is a special passive skill available to Guild masters.

Effect

Allows a guild to participate in the War of Emperium, War of Emperium 2, and War of Emperium TE. Without this skill, no one in the guild will be able to hit the Emperium regardless of their Hit Rate.

Guild System
Guild Skills	Battle Command • ~~Charisma~~ • Cold Heart • Contract with Kafra • Glorious Wounds • ~~Glory of Guild~~ • Guild Leadership • Guardian Research • Guild Extension • Official Guild Approval • Permanent Development • Regeneration • Restoration • Sharp Gaze • Strengthen Guardians • Urgent Call • Guild Storage Extension
War of Emperium (~~WoE Point System~~ • God Items Quest • Guild Dungeon Investment System) • War of Emperium 2 (God Items Quest 2) • War of Emperium Training Edition (God Items Quest 3)