Probably a couple of things that have already been suggested, but here you go.
- Pisces on the Gambler's Fallacy has been killing me consistently. It deals 90 damage to myself when I do things like shoot through a window and shoot someone close when I have 3x-2x damage on, even though I could literally just headshot that player and kill them in 1 shot instead. I seriously considered Rune of Annulling it off, though that seems like a huge waste. Pisces wave should probably be changed to do either less damage to yourself or maybe not be able to hit you at all, though I do know people like using it to "rocket jump", so it's hard to say.
- Rune of Annulment could possibly use a crafting recipe for a greater rune of annulment to allow your choice of a trait, or be allowed to be used on catalysts. Very few people want to annul something off of a weapon just to take a chance at breaking it back down a second time. As it is now, one of the only reasonable uses for it is when you're crafting something simplistic such as good quality legendary catalysts, but it seems a bit too rare to make it worth doing that. I understand if the way it's written disallows this sort of change, though.
- Crafting bag giveaways. I think a lot of people would be super happy with getting a bag of cool crafting catalysts that have unusual traits- Legendary trait catalysts with challenge scroll suffixes, gilded, half-gilded, lucky, etc and possibly some unobtainable crafting catalysts like godlike traits.
- Traded kills and post-mortem kills don't take into consideration lucky/gilded traits. I know this is just because it can't identify what you're holding anymore after you're dead, but it's a QoL that's a bit more relevant with virtually everyone having gilded/lucky weapons now.
- Worth noting that unconscious kills from tranq/tripwire don't count for challenges (and I assume dailies)
- Possibly make it so that you can upgrade 5 lower-tier challenge scrolls into one that is a tier higher? I have a lot of easy and mediums just laying around from fishing.