LEVEL 400+ si

 Olympus 

Creator: Unknown

Directions: Go to South Isle Landing east to western north edge to Isthimus, take boat to Sanitori Isle. Make your way to the omega forge, and use the back door exit to get into Olympus if you dare.

 Khaal Doom 

Creator: Trent

Directions: Go West to Foothills then Foothills West then North to Foothills Northwest, head to map pin.