Hi guys,
I just killed the dragon with just Solas and I'm lvl13. I did a lot of trial and error and I came with this strategy:
1.rely on a mage. This time I chose Solas.
2. when you're just about to exit that basalt tunnel at Dusklight Camp, the dragon activates itself and start circling the area around. Stay near the tunnel exit so you have a backup path just in case the dragon spits fire on you. At one point (about 5 minutes) the dragon gets bored and flies off to Blood Cliffs (the area straight ahead Lady Shayna's Valley).
3. as soon as the dragon flies off, charge straight on to Lady Shayna's Valley and kill all the Dragonlings that stay between you and the Blood Cliffs (I had to kill 4). Try and protect your mage so he/she doesn't have to use his healing potions,
4. When you get to the tunnel before Blood Cliffs, you will see the dragon on the ground. Take Solas and enter Blood Cliffs on the left side (go through the creek, focusing on trying to reach the top of the hill/basalt mountain in front of you). As soon as you get out of the creek with Solas (the party members can die meanwhile, it's not important), you will see a sort of path that leads up the basalt hill. Climb it until you get have to go left on a curved path. Go up.
5. When you face the dragon, you will have a scorched tree in front of you and a pile of basalt rocks. That is where you start attacking the dragon. Don't move too much towards the dragon/edge of the hill because when it kills all your party members, it will focus on you. Stay back and watch the trajectory of the fire spits. The tree will be destroyed soon and so will most of the basalt rocks on your feet but important thing is don't get too close to the edge of the hill. I blasted the mother funker for over 20 minutes with Solas (mostly Energy Barrage and Chain Lighting).
6. At half of life, the dragon will start squeaking a noise that will stun you. Watch where you are in relation to the edge of the hill all the time because if you sit too close and the dragon starts waving his wings, he will manage to pull you in. It's sad when you die and the dragon is at half HP :/ and you know it's totally doable but you just lost focus for a second.
7. At 10% HP, the dragon gets smart and flies off to where you are. It will land on top of the hill, like 2 inches away from where you stand so go down the curved path for 5-10 steps until all there is between you and the dragon is a wall "reinforced" with basalt.
8. Continue to blast it with Energy Barrage and Chain Lighting until it dies but do not move from where you are. Even if you don't have the dragon in your sight, it's better to hug the basalt wall and not get pulled inside the little tornado the dragon makes with his wings.
9. Collect underpants a.k.a loot the sinner!!! The loot is nice, I got a dagger, a staff and an awesome belt plus some mats.
10. Gloat! 