The Quasar BW is actually straight out of the Epic Bestiary itself- the only entry on the table marked D-14: Breath Weapon Dice Type on page 63 that's earmarked for Nehaschimics. I always figured that since neither of the sample Cosmic breath weapons actually shows up as the breath weapon of the two Adamic breeds we have, that just meant that two Adamics we didn't have must use those breath weapons; likewise, then, one of the two Nehaschimics we didn't have must use the d1000 breath weapon.
Following this logic, when I sat down to actually make my versions of Singularity and Quasar, I knew one of them would use that breath weapon, so it was just a matter of which one should use it (and then, what the other one used if not the d1000). Given the choice, I thought a Quasar (being based on the concept of a "white hole" which is still a theoretical object to our science- we've never actually seen one though we've now found thousands of black holes) would be the more appropriate dragon to spew forth enough energy to deal that kind of damage, which left the Singularity Dragon needing a new breath weapon. And of course, there are a couple of good choices among the Trans abilities- I picked Omega as being the most fitting. Unfortunately, the Void Dragon already uses that one, in a way (compare the dragon and the ability and you'll see what I mean- the average of a d6 roll is 3.5, so you can work out what the average result of the Void Dragon's breath will be at a given age category easily enough), so I had to tweak it for the Singularity Dragon to make it really work. That's why I added the bonus the Singularity Dragon gets from draining levels- more than anything else it was to differentiate its BW from the Void Dragon's. The fact that I was able to justify it so neatly within the critter's flavor text was just a bonus that made it an even better choice.
Following this logic, when I sat down to actually make my versions of Singularity and Quasar, I knew one of them would use that breath weapon, so it was just a matter of which one should use it (and then, what the other one used if not the d1000). Given the choice, I thought a Quasar (being based on the concept of a "white hole" which is still a theoretical object to our science- we've never actually seen one though we've now found thousands of black holes) would be the more appropriate dragon to spew forth enough energy to deal that kind of damage, which left the Singularity Dragon needing a new breath weapon. And of course, there are a couple of good choices among the Trans abilities- I picked Omega as being the most fitting. Unfortunately, the Void Dragon already uses that one, in a way (compare the dragon and the ability and you'll see what I mean- the average of a d6 roll is 3.5, so you can work out what the average result of the Void Dragon's breath will be at a given age category easily enough), so I had to tweak it for the Singularity Dragon to make it really work. That's why I added the bonus the Singularity Dragon gets from draining levels- more than anything else it was to differentiate its BW from the Void Dragon's. The fact that I was able to justify it so neatly within the critter's flavor text was just a bonus that made it an even better choice.