#Talk to Ice Mage in Elim.
#He'll ask you to find Ice Queen at Lands End.
#Talk to the Ice Queen and accept her quest after inquiring about the Waterfall spell.
#The quest is to extinguish the fire at Kim's house in Elim.
#Go the the House On Fire in Elim .
#You will obtain a message after you put out the first fire. After that continue to put out more fires until it says you'll wet your pants if you continue to play with fire.
#Return to the Ice Castle in Lands End.
#Indicate that you wish to learn this spell.
#You've now learned the Waterfall spell.