Wiki - The Naughty List
Santa himself is asking for help this year. Gryla has stolen his Naughty list and abducted all the children on it to create her favorite meal.
Defeating Gryla is the only way to save the children, but to do that you must first reach her.
Defeat a number of Gryla's minions and return to Santa to receive the objects you'll need to enter her lair to face her.
For completing the first part of the quest, Santa will create four Frozen Cauldrons, which will need to placed on the summoning pad to create the pad to Gryla's lair.
The pad is in the quest area outside the NE exit of the Ice dungeon in Felucca.