Hey everyone! I tried to finish my challenge appearances on my rogue now that 7.3 is out and I tried Agatha as an outlaw rogue. As many know this fight is really insane because of Roll the bones rng. I could barely keep up with the damage as roll the bones because I'm never lucky rubber ducky as I'm sure many of you are too :P. So the only times I even got close to 5-10 mill which i did several time was with slice and dice and it's consistency. So I thought I would help you guys out so you can complete all your challenges!
My ilvl: was 921 with outlaw, I used Will of Valera pants and Insignia of Ravenholt. During the rest phases with no adds you can heal up using the pants and the Insignia does a lot of damage. Other legendaries may be better but I never play outlaw so I have none.
The consumables: Crit food (vers might be better but I just had it so I used it.) Flask of the seventh demon. Two potion of prolonged power and drums.
Build: Swordmaster, Acrobatic Strikes, Deeper Stratagem, Elusiveness, Dirty Tricks, Alacrity, and Slice and Dice.
Fight Cooldowns: Save cds for the adds always or you will never make it. It's important to rotate all your cds including drums and prolonger power. Only use them with the umbra imps and other imps come up not during her cast or the imp masters. This is the key to sustaining the fight and get swarmed. The other tip is to make sure to pool combo points whenever she is about to do a cast. So when adrenaline rush is down and dreadblades use hero and potion etc. Without this you will just not have the damage unless super geared.
Add importance: So some people say imp masters first but I say fuming imps. If you kill every fuming imp you will have an extremely easy time. If you don't like some other people do then the patches will really hurt when you're moving or trying to kill adds standing in them. They only explode when they get close so u can keep distance till your ready to kill em also use gouge and stun on em. Then I would kill the imp masters only if shes not casting her spell do damage to that first. For the imp masters you can gouge one and stun the other don't chase them when they first come out let them come to the boss so you get more dps time on the boss. Then Umbra imps which make her immune and lastly smoldering imps which do a lot of damage to you.
If you truly master the fight you will eventually get it. I spent maybe 5-6 hours on this over two days. I got her to 6-10 mil many times but just fell behind and failed so I decided to do every mechanic correctly and had a much easier time. Good luck!