Huntress
AmazonThis build utilizes the 
Fairgraves' Curse bow to achieve literal infinitely scaling ignite dps. This bow applies the Spectral Fire debuff on hit, which stores all ignite damage the enemy takes for 8 seconds and then deals all that damage as a single-hit AoE fire explosion when the debuff expires. This explosion can itself ignite for much bigger damage, which can then be stored by the Spectral Fire debuff, which then explodes for more damage... etc.
Additionally, the 
Blistering Bond ring allows our fire damage to contribute to bleed magnitude, and makes our bleeds deal fire damage. As a result, we can apply big bleeds at the same time as our ignites, and we can utilize 
Herald of Blood with Fiery Death for clearing.
Saitha's Spear in the offhand allows us to aggravate both the bleeds and ignites on the enemy, doubling their damage. The cultivated version also applies exposure on hit, reducing enemy fire resistance.
