The /union Combination window is used to combine multiple items. This is necessary for:
- Preparing items to be equipped on a pet
- Undoing either of the above using special craftsman tools
Type /union at the General chat input line and press enter. Alternatively, open the Alt+I Inventory window and click on the [Combine] button at the bottom of the window. This will open a second pane with a single slot at the top and a 3x3 grid of slots below it.
Drag the items you wish to combine from your inventory into the Combination window. Once you have done this, click the [Confirm] button.