Guild Lock
From Growtopia
Template:ItemOldThe Guild Lock is a lock which locks an entire world for the guild. It costs 200,000 Gems (100,000 Gems for Super Supporters). Once the gems are paid, the world which the player is currently in will automatically be locked with a Guild Lock (provided that it was previously locked with the player's World Lock). You can not remove the guild lock like it was a normal World Lock. To sell a guild, Wrench the guild lock and tap “Get guild key” and tap Ok!
For more information on guilds and how they work, see Guilds.