The Daily Grind: What's the one feature you can't live without?

So many different systems in MMOs, so little time. From crafting to combat, PvP to PvE, housing to sieging, many MMOs offer a wide variety of features to their players.

Yet, there's always that one feature that really makes us love our game of choice. It's that one thing that we all read on the back of the box that really ignited our imaginations and made us stick the game on the counter and pull out our wallets. Today's question is quite simple: What's the one feature that you can't live without in your MMOs?

When you narrow it down to one, throw it into the comment box below and share it with your fellow readers. Now, discuss!