In the main hall there are these two knight armor costumes. One of them has something in their hand, the other one doesn't. Stomp on the head of the guy who has something, and you will get what he's got. pick it up, and go to the fridge. Open it up and there's something in a block of ice. Use the icepick to get it out, and you have it!
You get it from the ice knight on the ice planet.
the guy at the door fives it 2 you
It is Southeast of earth.
You just aim and click. The only time it is effective is when it goes into the dragon's mouth when there are no flames there (you have to put it to sleep for a second or two). Climb around the back, dodge the spike ball, and pull the lever. (see related question)
you get it from the guy in the ice world. ~Poptropica Queen~
Watch a YouTube video
You get the ice arrow for shooting the dragon in the mouth
in poptropica you need to talk to the fire knight and he will give you it
take them into the black hole
you need the ice arrow and flip the lever and shoot the ice arrow in the dragons mouth
shoot the mouth of the dragon after you pulled the lever on the back of the dragon
you have to go to the fire planet. get past a few things and then talk to the red knight.