A Kalphite Queen head is a rare drop from the Kalphite Queen. It can be combined with a slayer helmet or slayer helmet (i) to create a green slayer helmet or green slayer helmet (i), respectively. Doing so requires purchasing the ability Kalphite khat for 1,000 slayer reward points.
It can also be stuffed and then mounted in player-owned houses in the Skill Hall at level 78 Construction, but it is a one time use and it cannot be reclaimed.
Before the Kalphite Queen head can be mounted, it must be taken to the taxidermist in Canifis. She will charge 50,000 coins and turn it into a stuffed kq head. They can then mount it in their player-owned house using 2 mahogany planks and 2 gold leaves.
Talking to a mounted Kalphite Queen head in your house is part of the Desert Elite Achievement Diary.