As you step foot out onto a desolate plateau, a Blind Dragon screeches up into the sky and blasts lightning down. Dodge to the side of the opening balcony level and prepare for an epic encounter.
Run down the stairs to the large plateau area that has three rock perches and a ballista on opposite ends. The dragon settles down on the rock perch to your right, so sprint over to the opposite ballista and take aim. You have just enough time to fire off one shot in between attacks. Fire a shot, and hit or miss, disengage from the ballista to play defense.
The Blind Dragon may not be able to see, but it has an uncanny sense of your location and breathes lightning balls directly at you. When you see the energy undulations beginning around its mouth, break for cover, especially if the dragon is pointed directly at you. Sprint gets you clear of the brunt of an attack if you race out of the blast area fast enough.
Skeletons spawn around the plateau to aid the Blind Dragon. One partner needs to be on "Skeleton patrol" the whole time, crushing the skeletal enemies as soon as they pop up. If you don't destroy them quickly, their vast numbers begin to overwhelm. Even if their damage doesn't kill you, if they pin you down and the dragon sends a lightning blast your way, you're as good as dead. Keep the plateau clear so it's easier to dodge dragon attacks and reach the ballista unimpeded.
Continue to shoot ballista bullets at the Blind Dragon. After two or three hits, you unsettle the dragon from its perch and it climbs to the skies. Circle around the plateau and watch for its lightning attacks. When it drops back down to the second rock perch, it's safe to begin your attack pattern—this time from the second ballista opposite the new perch.
Several direct hits will eventually drive the Blind Dragon off the second perch.
As the battle draws to a close, Dreads start replacing Skeletons on the battlefield. Once you have four or five Dreads running around, it becomes nearly impossible to concentrate on the dragon. The partner not manning the ballista must eliminate the Dreads as they spawn or you're doomed.
When the Blind Dragon lands on the third perch, you've nearly finished it off. In between dodging Skeletons, Dreads, and lightning blasts, keep returning to the ballista and launching missiles at the beast. Two or three more strikes drives the creature up into the air for one final blow.
Swing the ballista to its highest arc and aim at the Blind Dragon hovering up in the sky. One final blow sends the dragon spiraling down into the deep pit. The Dreads and Skeletons crumble when the dragon dies, and it's time for celebration...except, you both realize you actually have to climb down into that pit and face the worst of worst horrors.