silver_sword wrote:
they probably use the moehog skull.

Moehog isn't the best pet to have around anyway... doubt they use it even.
Anyway, my cents. Rainbow frost cannon is one of the oldest weapons created. It was created along with his buddies the Blue,Red,Yellow,Black frost cannons. They were all very much wanted in the past.
So far, only the Black and Rainbow is still consider good. The others are pretty much weaker and cheaper too.
If i am not wrong the Black should be the stornger one. Anyway, if you are going for the FREEZING type weapon you should not take the cannon but instead go for H4000 Helm(expensive) or Freezing Potion(cheaper alternative) or Freezing Scroll (cheapest)
Take note all of the above can only be used once and is 100% freeze. however, only the helm is indestructable (cannot break) the rest has a slgiht chance. Check IDB for more info.
Side Note: If the prices of the Rainbow Frost Cannon does rise above 200k/amt you got it for you should sell it. However it is your call. As i said, this item is very old. It has a higher chance of being Retired.
Retired = Prices SKY ROCKET [Since some may lose them to glitch/frozen accounts/pant devil/no production]
Therefore, choosing to sell may or may not be your best choice.