You need to be
at least level 60 and buy a Premium Dungeon
Pass from the Potcash shop to be able to
enter.
Tomb of Heroes (Premium Dungeon) is accessed
by going to the NPC WillTheRich at 356:238
in Bichon Wall.
There are three instances of Tomb of Heroes
separated by level ranges (60-79, 80-119 and
120 onwards)
