Like most areas, there are 16 skyshards in total. Caverns contain 7 of them. Most can be found in this zone without running into many enemies. For a speed run, grab them in order of:
2, 16, 1, 10, 11, 3, 12, 6, 7, 4, 14, 5, 8, 9, 15, 13
1. In the charred hills above Daen Seeth.
Harborage - Travel North around the coast and you will see it near the rear entrance to Davon's Watch.
2. Near Bal Foyen's gate.
Davon's Watch Wayshrine - Travel SE towards the gate to "Fort Zeren". It will be on the right side of the gate around the corner.
3. Staging an attack on Arand.
For Arand Wayshrine - Directly NW of the wayshrine. In the back of the enemy camp.
4. A lady on a cliff, beyond Sulfer Pools.
Hrogar's Hold Wayshrine - Travel SE towards "Dagger's Point Invasion Camp". When directly South of The Matron's Clutch, you will see it near a statue on the cliff.
5. Among mushrooms, high above Lukiul Uxith.
Hrogar's Hold Wayshrine - Follow the road NW looking on top of the Eastern cliff.
6. Among pools of fire, above Vivec's Wayshrine.
Vivec's Antlers Wayshrine - Directly Sourth of the wayshrine. Up the hill towards the lava flow.
7. South on the Ashen Road, where lava flows.
Ashen Road Wayshrine - Follow the road south past the Magmaflow Overlook crafting station.
8. Tucked away, on a grotto's mantel.
Fungal Grotto - To the west, behind the entrance to the dungeon.
9. On a hillside behind a plantation.
Sathram Plantation Wayshrine - Directly SW of the wayshrine, past the Sathram Plantation. Behind one of the buildings. Near the edge of the map.
10. Left to rust beside ancient arms.
Inner Sea Armature
11. Used to strike flames underground.
12. Listening to the Spinner's Whispers.
13. Found in soft dirt by daggers.
14. Where a fiery tide rises.
Softloam Cavern - This is a two story cave. Just keep going forward until you are on the upper floor and head towads the direction on the map.
15. Discovering a taste for madness.
16. Drowned in the south by a clever bird.