Distant Legend is a special chapter in The Gate of Ages that was added during 02/08/2012 update.
It contains 2 instances; [Tower of Soul]which is avaible for players at level 100 only, and the Mysterious Island which is unlocked after beating Save the Beauty quest.
This chapter also contains several high level drops, legendary orange items, and might be useful to gain BA for maxed level players.
It doesn't contain any hireable heroes.