11 Mar 2011 28 May 2011
There is a quest available on Act III (Year 7) after becoming the Champion of Kirkwall, your business partner (Hubert) in Hightown Market informs you of trouble at the Bone Pit mines. Fast travel to the Bone Pit and go down the path to the very bottom that was previously blocked off in prior years to encounter the High Dragon.
First and foremost, each class will have its strengths and weaknesses in this battle, so it should vary for everyone else, depending on abilities and specialization. I was level 18 Warrior (Two Hander/Reaver) at the time with Varric, Aveline (Tank), Anders (Healer) and was able to defeat the High Dragon on Normal without any or very little fire resistance. Not saying resistance won't help because it will, just that I didn't have any equipped if I recall. If you have a sturdy team and a good amount of health/mana/stamina potions, it should be a decently easy battle.
The High Dragon's basic attacks have a wide radius even while flanking its sides and back so the melee will occasionally get damaged. It also has a front funnel fire breath attack, an area stun to those who are fighting up close, and will occasionally pick up an ally (hopefully your tank) who has its attention at that moment and will nibble on them for a bit.
There are also two phases of this battle; the phase as described above fighting it normally and a phase when the dragon flies up on the hill and summons a lot of dragonlings. There will also be a couple of elite drakes in the mix. The High Dragon will also spew out fireballs to the ground which should be avoided. After the dragonlings and drakes are cleared it will return to the ground.
The High Dragon will still be vulnerable to ranged attacks from rogues and mages while on the hill but the dragonlings on the ground should be top priority. Remember to keep your squishies a good distance away and try not having the High Dragon facing their direction when it breathes fire, so have the tank turned away from them. If you have also invested some points in Aveline's Guardian tree, the Indomitable passive ability helps tremendously as it has knockdown and stun resists by 100%, great for staying up right and keeping the High Dragon's attention.
Lastly, a couple of things you might want to bring along are a healthy amount of health potions and, unless you don't have abilities or passive abilities to regenerate mana/stamina at a decent pace, it doesn't hurt to have some mana/stamina potions as well. If you have access to Lifeward potions (credit Duderino Abides) it doesn't hurt to have them on one or a few companions. If you also have access to some Mythal's Favor, you can revive KO'd allies with them. Fire resistance gear and runes, will benefit from this battle as well. Furthermore, you can always bump the difficulty down to Casual if problems persist.
As a Warrior I had most abilities in Two Hand tree and Reaver spec, they're able to sustain little damage while dealing out damage of their own, even an alternative healing besides potions and the spell.
Playing a second time through as a Rogue, I had difficulty with my first set up. I changed my abilities up so that I had some points in Dual Wield for the Chain and Explosive Strike, some in the Scoundrel tree so I could keep my stamina constantly regenerating, and a good majority of ability points in Duelist. Duelist's Parry sustained ability and Vendetta helped out tremendously and puts out a decent amount of damage with higher survivability. (Duelist also made me enjoy the Rogue class more than I thought I would!)
For your trouble you are rewarded with the achievement, the Champion's Body armor for the set, Dragon Blood for crafting, Fire Gland for the Herbalist quest giver, and a few other goods. Good Luck!