How to go to ivory tower floor 8? Please help guys

How to go to ivory tower floor 8? The last time I played L1 is year 2010, and everything has change now. I’m a newbie, please kindly help me guys. Thx

There is no longer an IT 8F. It was removed and the two dungeon floors were added instead. To get there see the NPC at the stairs from IT 3F to 4F. Demon is on one of the floors. Can’t remember the name of the boss on the other.

Rift Guardian is in the basement 2nd floor, Demon is in the basement first floor.

The first floor has less spawns and thus is a bit easier to hunt for lower levels.

Ivory Tower floors 4-8 were changed completely and will be used for a raid sometime in the future.