Ruby Paragon

The  can be found on a Frost Giant in. It is one of various Paragons.

Acquisition
During the quest "Touching The Sky", the Dragonborn receives an Initiate's Ewer. While inside the first room of Inner Sanctum, there is a pedestal to the left. When activated it, a door opens; it leads to a room with a Frost Giant in it, with a chest containing leveled loot. Kill the Frost Giant, and the Paragon is part of the various loot found.

Use
To use the Ruby Paragon, find the Paragon Portal, and activate the device. Go into the portal, which will go to the Forgotten Vale Forest. There will be a leveled Falmer boss and a few Frost Trolls. Auriel's Shield is equipped by the Falmer.

Quests

 * Found during or after Touching The Sky