Beleth droppped on that raid an Icarus Spitter Bow, a Vesper Stormer and a Cloak of Holy Spirit (under the yellow "You have earned Vitality Points" line).
And here is the complete list of all possible drops: http://power.plaync.co.kr/lineage2/%EB%B2%A0%EB%A0%88%EC%8A%A4
Click on the brown links and you can identify the things by their icon.
Smittie is not completely right. Although it's in Korean letters, you can still understand it, because most of the items have English names. All you have to do is learn 40 letters. It's not more difficult than Cyrillic. Our regulars at elliebelly.net are pretty good at that kind of thing; the Beleth drops were actually not "decoded" by me but by horuswar: http://www2.elliebelly.net/index.php?name=Forums&file=viewtopic&t=677&start=135
yay! Beleth ring and some kind of a power book to improve hp regen by 23 ??? BY TWENTY THREE??? that is insane book for Orcs\dorfs... That means An orc and a properly setuped dorf can have like 100hp regen per tick wow!!!
First thing I noticed was they petitioned (my guess is to let the GM know so they can make an announcement?) and there's more than one response! Must be nice to have GM's that actually talk to you there...
Imagine the canned response from our GM's?
Petition: OH EM GEE WE KILLED BELETH!
GM: Thank you for waiting 40 minutes for me to answer. Please repetition with the names of the offending raid bosses. We take this very seriously and will look into the matter. However, we can not interfere in player to raid boss actions. Because we've asked you to repetition you've been given additional petitions for the day.
*slams the door shut on your face*