There was an event held on 26th August 2009, which named as 'Hrin & Lorenza's Birthday Bash'. Based on the event name, I guess the reason of holding this event is quite obvious. That's right, this month is the birthday season for Hrin and Lorenza (although I don't know the actual date of their birthday)! This event is about enhancing a sword that named 'Birthday Sword' which was given by the IAH-teams. Every family will receive the only one 'Birthday Sword' and mules will not receive any Birthday Sword. These birthday swords were inserted into the Adelina Booty Search loot, which means players ought to claim their swords from the Adelina Booty Search. The Birthday Sword is a level100 sword that has 30 AR, 1 attack and can only be used by fighters. It cannot be traded nor chipped. The higher the enhancement of the sword, the better the reward that you will get. Enhancement booster and Imperviums are discounted up to 30% too during the event was held. Once the sword is broke, it will forever gone and non-refundable. The discount is indeed money-saving for those who aimed to get +6 and above Birthday Sword. This event will end on 24th September 2009. I had claimed mine on 27th August 2009, at 7.02 PM and I managed to enhance it to +5 without the help of enhancement booster on the next day. Oh yeah, 500 pet foods for free! I had seen quite a lot of player trying to enhance their swords +8. Of course, the word 'failed' will often appeared on the system tab. That's what you get for your greediness, I guess. Below is the simple table of enhancement of the sword needed and the reward that you will receive.
Enhancement = Reward
+5 = 500 Pet foods
+6 = 3 x Blessed Angel Wings
+7 = 30 x Zodiac Box and 30 x Zodiac Chest
+8 = 3 x back wings (365 days)
+9 = Regulus' Passion recipe (33AR Great Sword)
+10 = Altair's Cunning (33AR sword)
Birthday Sword:
Someone failed in Birthday Sword 8 enhancement: