Open the party window
Press P for party management while chat is not active. The party HUD is separate from the management window.
Party and guild invitations open a named Accept/Decline prompt. You do not need an Alt shortcut to accept. Use a current launcher client so the invitation window is available.
The guild hall
Press G while chat is not active to open the guild hall. Creating a guild consumes one carried Emperium. Features include membership, roles, notices, guild chat, shared storage, growth, and support skills. Use /g followed by your message for guild chat.
Guild storage is permission-controlled and available in towns. It does not recover items carried by a permanently fallen character. Emergency Call brings eligible members within the same map and instance; it is not a world-wide teleport.
Emblems, alliances and rivals
The guild leader designs the guild's emblem in the guild window's Banner & Allies tab: choose a shape, a division, field colours, a symbol and its colours. The emblem appears beside the guild name on nameplates.
A guild can propose an alliance to up to three other guilds; the other guild must accept. A guild can also name up to three rivals. Allied guild names show in green and rivals in red, and allies never harm each other during a siege.