Groups and Chat
When you join a guild, you gain access to a special chat channel that only your guild uses. You can talk to other guild mates and get into groups for quests, leveling and farming. You should look for a guild that has players close to your level, or higher-level players that don't mind helping low-level characters, or "lowbies," with quests and character progression. Many different types of guilds exist in "Dungeons and Dragons Online," from casual guilds started by a group of friends to large, multigame guilds that have many members.
Guild Levels
Guild levels, also known as guild renown, affect the types of rewards that the guild has access to. Players in the guild earn guild renown by killing monsters and discovering guild trophies. Various guild rewards are unlocked as your guild gains levels through renown. Some special rewards you'll have access to for being part of a guild includes reduced price vendors, NPCs for airships, resistance shrines and guild chests.
Crafting and Equipment
You do not have to work on crafting skills if another guild mate has already leveled his craft, as he has access to the recipes that you need. Your guild may also keep crafting materials in the guild bank for anyone currently leveling a crafting skill. Your guild mates may also have extra equipment and items that they no longer need, but you could use to increase your leveling or farming speed.
Raiding
You can go into raids in Dungeons and Dragons online with a pickup group, but the raid encounters require equipped characters who can coordinate together. It is easier to organize a raid group over the guild chat than over general or private chat with many different players. Your guild may also have a website with a raiding schedule so you'll have a regularly scheduled time for raid encounters as well as a set raiding group.