What level do you need to be to get the quest to get in there, and from who. I beat wysteria at around level 30 - 35, and got no quest to go to the tower of the helephant.
You are required to be level 60 to be inside, but I don't recommend you doing it until a higher level because trust me, it's the hardest dungeon in my opinion.
I wouldn't even try to do the dungeon with seven levels and over 15000 health bosses it is hard, and the last boss has over 20000, summons minions every round and you cannot even use traps without it not being removed, it is not worth it.