I used all three exotic swords during heroic strikes to see which one does more damage to majors and ultras, and also Omnigul, and Psion flayers. Conclusion, Raze Lighter is the new Gjallarhorn, it shreds through ultras and majors and rips the flayers apart. It is a effective weapon all around, it does a ton of damage and gets the job done with the right set up. After testing Bolt caster and Dark Drinker, they are only good for clusters of ads that spawn and you need to get rid of a bunch. But getting more close and personal if you want to take down a major or ultra quick is more effective. Use Raze Lighter! Plus the name sounds badass.