Speak to Kleeoh at 2.5S 86.5E. This flags you for entrance into Behind the Waterfall to the south at 8.7S 85.7E. Speaking to Kleeoh only needs to be done once.
Part 2: Behind the Waterfall
Beginning with Behind the Waterfall at 8.7S 85.7E, there are a series of 4 dungeons.
Kill Mowen Udaun
then quickly go into the portal that appears on the north side of the
room, this flags you for the reward. If you miss the portal you will
need to run all the way back and kill Mowen again.
Speak to Oolutanga, the Tusker King again, don't move until you are given the Fabled Tusker Paw.
It will have one use if you were in the group and used the portal that
spawns when Mowen dies. If you did the most damage you will be given a
three use paw.
To the south of Bobo are two portals, do not use the exit portal. Go inside Idol of Wishes in the SW corner.
Inside this dungeon are a series of tusker statues, each one
corresponds to a skill and most give experience into that skill
(random) or alternatively give a special reward about 3% of the time.
The main exception is the Statue of Artificer's Wish which always gives the spell Recall Aphus Lassel. See the table below for a complete list of possible rewards. The possible xp amounts per turn in are:
100,000xp
250,000xp
500,000xp
1,000,000xp
3,000,000xp
The quest can be repeated every 3 days, during this period you cannot renenter the arena where Mowen spawns.