More Info here:
http://l2wiki.com/Dimensional_Warp
And from Ertheia Patch note:
The Dimensional Barrier hunting zone has been added.
o Only Level 99 characters can enter through Resed in Faeron Village.
o Instance dungeons do not bind, and 1~4 people can enter simultaneously.
o The instance dungeon disappears 15 minutes after entering, and the duration increases by 3
minutes as each floor is completed. (Difficulty increases in each floor.)
o There are a total of 35 floors in the Dimensional Barrier. The raid boss Abyssal Makkum
spawns on the final stage (floor 35).
o Abyssal Makkum raid boss drops 1-2 Dimensional Bracelet Enhancement Stones and has a
very low chance to drop Divine Inspiration Lv5/Lv6.
o The chances of having an event are determined by the amount of Warp Crystals
(12/240/1,200) given to Einster when starting the instance dungeon.
o Warp Crystals can be purchased from Resed and Einster for 100,000 Adena, and a minimum
of 3 Warp Crystals are needed to enter the instance.
o There can be a total of 5 events, in which Imp monsters will appear, with a chance of
dropping high level items.
o Unworldy Imps and Abyssal Imps drop Secret Ancient Tome Fragments, which can be used
with Elcyum to purchase Divine Inspiration Lv5/Lv6.
o The Dimensional Bracelet can be obtained by completing the Dimensional Warp, Part 1
quest. Each time the Dimensional Warp, Part 2-6 quests are completed, the grade can be
increased by 1 each time as well.
o To increase the Dimensional Bracelet stats, you must compound the dimensional bracelet
with a Dimensional Bracelet Enhancement Stone. The maximum amount of stat boost on a
Dimensional Bracelet is +5.
Thanks a lot