Guild Herald

SS Companion

Summons a non-combat pet/vendor that allows you to purchase Guild Rewards and sell loot. Lasts 5 minutes, has a 4-hour cooldown.

The Guild Herald is similar to the Guild Page, which has an 8-hour cooldown, but unlike the Guild Page, it can be used by other members of your guild.

It is bound to your character, not to your account. In other words, you will have to get Revered reputation on your guild and purchase it on every one of your characters.

It is often used with Argent Squire to vendor items during dungeon and raid ruins.

Source
Requires to purchase.

This item is sold by the following vendors for after completing the guild achievement :

Pet Journal
When guilds have accumulated enough wealth, brave soldiers are often called to bear their standards.

Wealthy guilds draw the attention of soldiers willing to carry their standards into battle.

Quotes
...
 * Alliance gossip

How may I serve?
 * Horde gossip