Dragon Age Inquisition: Hidden areas in The Forbidden Oasis Dragon Age: Inquisition Guide

The above map presents locations that are more difficult to access, which you can visit while exploring The Forbidden Oasis.

The temple door swings open after you use the shards

Point 1 on the map marks the entrance to the Solasan temple, which is connected with "The Temple of Pride" side quest. To access the temple, you need to spare six shards and to learn more, see the walkthrough for the quest mentioned above.

Accessing the individual chambers of the temple also requires shards

Point 2 on the map presents the inside of the Solasan temple, where you find locked doors. The pattern of behavior here is similar as in the case of the main gate in point 1 - you need to spend shards that you find in the game world, to open new rooms. Each room of a given group requires you to spend more shards and defeat a group of stronger monsters. On the other hand, it offers better loot. Most probably, you will finish the exploration of the temple towards the end of the game, after you have collected shards in the other locations of the game world.