The Elder...Amethyst Paragon - Legacy of the Dragonborn - Fan.
Opposite the end of the river that leads into the Darkfall Grotto is a frost giant that is home to the Amethyst Paragon.
Where is the paragon platform?The Wayshrine of Learning is where you can find the Paragon Platform.You can see a path rising up a series of flights of stairs on the shore if you follow your way along the water.
There is a portal across the river from the Frost Giant.It is not required to collect all of the Paragons before entering a treasure area.The side of the portal gate has a Paragon Socket on it.