When you purchase this key, you get to choose which of the 5 items you want. This is not luck based.

In the server, you can choose one of these:

• 1 Amethyst MultiTool (4 Tools in one item)
• 1 Amethyst Tree Chopper (Breaks Trees Instantly)
• 1 Amethyst Drill (Breaks 9 Blocks At Once)
• 1 Amethyst Sell Axe (Instant sell Chests)
• 1 Amethyst Bucket (Drains 27 Water At Once) (self destructs after 3 days

The amethyst gear gives you powerful stat bonuses and unique effects, making it some of the strongest equipment you can get on the server.