Zajako upgraded his equipment to become legendary, he is now completely immune to damage until exposed to his weakness of people QQ-ing. The productive Game Master also may show up allowing you to craft special pre-release X grade weapons, so keep an eye out!
You can now open the Mysterious bags to get Letter Blocks, which can spell different words for you to turn in. The resulting bags are currently not working however though, so stay tuned for part 3 of the event which will provide the prizes for these items.
Legendary Zajako can spawn in a new spawn-wave type. Also a new event monster called Zajako’s Buzz which is only killable via clan-qq or using the special Bribe Amanda to QQ at Zajako items which you can get from the gift master, clan store or vitality merchant for a 10 minute version. Also with each spawn there is a secondary spawn location that is purely Buzz Monsters and one boss spawn. These Buzz mobs should be huntable by a small group of clan members with the QQ clan skill with ease.
There are several new X grade weapons and armors released with this part of the event. Many of which will get their stats with part 3 of the event.
Here is the rarity of the letters:
RARE: P C G H J M T X
UNCOMMON: B U D F Z O S V Y Q
COMMON: L 1 . 5 A E I K N R W
Good Luck, Have Fun!!