From Izanagi Online Wiki

Guild Hideout is located in BWT - Commercial Area from Guild NPCs by talking to Harold. The Guild Hideout is a structure that members can visit, and it is exclusively room that guild members only can enter. A meeting place where guild members often meet for Guild Raid. In Guild Hideout have daily quests offered to guild members in order to gain Guild Points. Players are offered 3 GP Quests daily by Ebezza, and resets at a specific time (4:00 PM - EDT, 1:00 PM - PDT).

The Guild Leader can upgrade the Guild Hideout using the GP and Gold collected from the members.

So, you need to make sure the Hideout Lv. is raised through

"If you are a guild, take care of your friends. That is all I have to say." -Hiro Mashima