The update will introduce guild levels, guild quests, and guild skills. Taking on quests as a guild will award experience, allowing the guild itself to be leveled and opening up guild skills for purchase. Those skills can be used by everyone within the guild, thus creating a whole different vector for advancement. There’s more to come through the remainder of the month, but if you’ve long wanted more involved stuff to do with your guild in TERA, it looks like you’re getting your wish.
Source: Official Site