Stamina Dragonknight build with crafted sets and a vanilla monster mask.

Best race: Dunmer. Orc, Khajiit (slightly less damage), and even Wood Elf will also work.
64 points into stamina.
Food - Braised Rabbit with Spring Vegetables can be used both for parsing on a dummy and in content. DK sustain is very good.
Potions - Essence of Health or Crown Tri-Restoration Potion (stamina regen, magicka regen, health regen).

Opening:
Cast Deadly Cloak and Flames of Oblivion away from the target, come closer, throw a trap (Barbed Trap), activate the ultimate Standard of Might, use Degeneration, then Stampede, Venomous Claw, Eruption, Сarve, Engulfing Flames.

Rotation:
Maintain all DoTs and in free time, spam Molten Whip.
Priority of DoTs - Carve(don't let the stacks drop), Degeneration, Stampede, Venomous Claw, Eruption, Flames of Oblivion, Barbed Trap, Deadly Cloak, Engulfing Flames. When all DoTs are active, spam Molten Whip.
The DK doesn't have an execute phase, so just maintain the rotation throughout the entire parse.

Important addition: The DK has a hidden buff of 300 weapon and spell damage at 3 stacks when Molten Whip is on the bar. Stacks build up for 15 seconds when you cast skills from the Ardent Flame line (all except Molten Whip - Engulfing Flames, Flames of Oblivion, Venomous Claw). Usually, this buff maintains itself, but sometimes the stacks can drop. Therefore, for maximum damage, you can either use an addon Cooldowns to display a timer for this buff, or recast Venomous Claw 3-4 seconds earlier.