For AoE:
RoR.builders - Slayer
You could drop Rampage and No Escape as they are pretty bad in favor of the M4, but then again as Slayer you are typically either dead or the battle is over by the time that you would get there. Slayer doesn't have a worthwhile M2 so morales won't really be your thing either. Again, the devs hate this class and you have to be a WL or something cool to get a good M2 (you would think that part of a rework would be to give each class something to do with each morale stage but you'd be wrong).Tactic wise, same old same old. Wild Gambit, Brute Force, and whatever two other DPS tactics you want. If you are pugging, you can bring the heal tactic and AI to try to live longer but good luck with that, I think you are better off with just pots.
Accuracy can be good for big fluffy numbers in blobwars. But again, having to burn a tactic slot just to make you anytimer AoE ability hit 24 targets/viable is lame AF and used to not be worth it when you could spam ID, but that is what we got. If you have a grp with a good SM you can still spam ID via Winds (the scotch tape and glue holding Order largescale DPS together). One would also think that if Flurry hit 3 ppl when AoE cap was nine, and it was 1/3 of cap, that for 24 man AoE cap it would hit 1/3 of 24 for 8 targets, but again you would be wrong.
For 2h:
RoR.builders - Slayer
There are some variations to 2h but pretty much you are either there the same old Devastate, Deathblow, Spellbreaker three hit combo, or you are smallscale and will bring the heal channel instead. Some ppl have played around with the two exhaust reducing tactics but I find them pretty detrimental. Best time to bring Power Through is when you have a good 6 man around you but they will probably wish you were playing something better than 2h Slayer to begin with.
Disclaimer I used to play 2h small scale ages ago but gave it up. I am sure there are many who try harder at it than I do.
Renown go for full offense, defense is useless to Slayer due to class mechanic and hatred of the devs. Ppl don't call the class all risk no reward for nothing.
Gear is the 5 parts sov, 4 parts triump with annulus/vale/bastion stair jewels of you choosing. Always.
In sum, Slayer used to be some pretty woefully designed stuff with the benefit of great abilities in Rampage and ID spam, now its just badly designed. Not to mention the rules for Retribution change constantly, its apparently also a despised ability but they can't figure out quite how they want to nerf it.