its for a quest on iceberg

gain the crystal from maka mountain cave. (keep it)
go to iceberg.

when you enter you will see 2 pedastals. one of them has another crystal. take it with you

all the way down down down to the 4th floor i think. you find snow white and her 7 dwarfs.

the dwarfs want to wake her up but the key was stolen/ misplaced (the crystal you have).

talk to the dwarf if you have both crystals. he'll take them/ or tell you to place them (can;t remember) either way. a fight will start. when you win the princess will wake up.

you get 2 clear devil spar and exp
the spars are best used for getting superior alchemy. you need 5. you can get more by manufacturing 10 devil spar pieces in a crystal furnace to make 1 or killing wind panda in china (thats fastest way i know of) its RARE drop so will take you a week or more (if lucky less) to get. combo with pet to increase chance. non tradeable.