Christmas arc


 * the start of the event (december 17th) is when a message is spread throughout the game that Frosty the Snow Lord has declared war on all of aincrad and that they have only a day or so to prepare, with the warning of how they will die if they dont defeat him within 4 days
 * the attacks will be from a large mob of snowmen (equivalent of level 76 mobs) who freeze any and all players and move between levels
 * if players are not saved within 2 days of the inital attack, they will die
 * the only way to save them is to defeat the event boss, Frosty, in his unrevealed area and guarded by a small force of more snowmen
 * his army's camp is on level 58 at the summit of one of the mountains
 * upon defeating a snowman a rare drop top hat is given to the player
 * on the way to frosty's base silica, lisbeth, and schmitt are frozen; kirito is frozen during the final fight
 * asuna lands the final hit on frosty and is rewarded with a white cloak that acts as additional armor (it is the semi-transparent veil thing that goes down past her knees