This is what you get with Hydra rank:

• Unique “Hydra” prefix in the player tab
• Unique “Hydra” prefix & Unique “Diamond” suffix on the player's nametag
• Ability to use color codes on signs. (vanilla + hex)
• Ability to join a full server.
• Ability to put up to 5 items up for auction.
• Ability to keep your exp level when you die.
• Ability to keep inventory on death.
• Ability to set 5 player warps.
• Reduced /rtp cooldown
• /craft - Opens a virtual crafting table.
• /enderchest - Opens a virtual Enderchest.
• /hat - Set any item as your hat.
• /show - Showcase an item  in chat for the entire server to see.
• Total of 25 /sethome's - Allows you to save home locations and teleport back to them.
• 5x 6 row  /pv - Virtual chest that saves items, Even on death.
• /pweather - Changes the weather just for you (visual effect only).
• /ptime - Changes the time just for you (visual effect only).
• /nickname - Changes your display name.
• /back - Teleport back to your previous location, even when you die.