Once you have defeated the Guardian boss, you can enter the main Rhogar Temple from the Eternal Flame. As soon as you enter, look to your left to find Yetka standing nearby looking at a Runic Inscription on the wall. Talk with her for a Stone of Divine Understanding and several audio notes. The Stone of Divine Understanding will allow you to read the glowing runic inscriptions.
There are four of these inscriptions in total hidden within the Rhogar realm. They can be found in the following locations:
- Chamber of Lies - Right in front of Yetka in the Chamber of Lies.
- Chamber of Lies - In the small room with the Anvil next to the first of the two switches we had to pull in the Chamber of Lies to reach the Annihilator.
- Eastern Antechamber - On the second floor of the Eastern Antechamber opposite the entrance.
- Sacred Hallways - Through the door to the left of where we spoke with the Crippled Rhogar after the fight with the Infiltrator.
Upon finding and reading all four of them, you’ll net yourself 1,500XP and four Audio Notes (one for each of the notes you read!).