You have 15 minutes to reach and break through the door, and you must accumulate a certain amount of kills before you can attack and break it down. Getting to the door in the first place requires power, concentration, and precise clicking. The mobs constantly regenerate and you are battling through a narrow ledge completely jam-packed with them. BKs with 700 defense will be completely mauled; let me tell you. (The door has like 50k HP too btw).
When you're through the door the real battle begins, as the whole event is actually a race against the other players. Past the door you will fight the hardest mobs in the game, but Blood Castle-exclusive mobs; you don't see them anywhere else. These mobs drop Phoenix Feathers - the item required to make 2nd class wings, but they drop very rarely.
You must walk straight into all these mobs and start beating the living crap out of a huge coffin-like object. It has several layers, each stronger than the last. When the coffin has been destroyed an item will drop out, and here's the bit KS'ers love best. First to nab the item practically has the game in the bag, but there is one final challenge. Now that you have the item you need to go ALL THE WAY back again! And don't forget that all this time you are being completely battered by these level 100+ mobs in every nook and cranny they can reach.
If you make it all the way back you recieve an item. The item you recieve is one of the unique Blade Knight, Muse Elf, or Soul Master items. The weapons that have their name in pink.
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