how do u get a razor queen to appear?
... then how do u kill it
After having all the gloopies (from green gloopie to normal queen) in your bestiary, just start a nest and once you get too about 5-15 gloopies left dont kill. Soon enough Razor queen comes out.
To kill a queen, first slash at it so that it "backs off" then wait until she's ready to attack (you'll know when the head is slightly closer to you.) Just before she attack, get closer and then attack.