Guild Storage Extensionhttps://irowiki.org/wiki/Guild_Storage_Extension

Guild Storage Extension
Type:	Passive Skill
Levels:	5
Prerequisites
	(Guild Master) Urgent Call Lv. 1, Guild Extension Lv. 10, Cold Heart Lv. 1, Sharp Gaze Lv. 1

Guild Storage Extension (Alt: Guild Storage Extension) is a special passive skill available to Guild masters.

Effect

Grants access to the Guild Storage through Storage Keepers located in towns for 1,000 Zeny.

Guild masters can assign storage access to guild positions through the guild window.
Only 1 player may access the storage at a time.
Transaction history is logged for the 100 most recent transactions, and recorded for up to 6 months.
Guild Storage will be closed automatically 2 minutes after opening it.
Minimum guild level to have all the prerequisites complete is guild level 20, thus guild level 21 can have level 1 guild storage (guild level 25 for level 5).

Below is a picture of all required skills to get Guild Storage Extension Level 5

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)