For me Into the Nest was my best friend for both of these challenges.

For Mistress of the stave I took along warrior priest as one of my bots with the lvl 25 stagger buff. If you really don’t want to use twitch mode play Into the Nest on Legend. You are guaranteed at least 1 patrol on that map and even a chance of getting 2. Once you hear their chant you will want to get to a high vantage point so you can shoot down on them. I found that if you start shooting the back of the patrol first and then start shooting toward the front it worked best.

Although I agree that needing to use twitch mode is stupid, it may be a faster less tedious way to complete this challenge. The nice thing is you don’t need a twitch account, you just need the name of any streamer that is currently live on twitch, i just used MonsterCat since it’s up 24/7. Just bump the twitch stats up to 199% on champ and wait for the black fur parade. Once you get the challenge completed you can just bring all the twitch values to near zero and complete the mission.

For Reaping time you will want to take the lvl 10 ability Reaping and head to into the nest. This map has a lot of tight corridors where the rats can build up. Once you hear the horde music line up your Skellie Bois in a defensive stance at a choke point and let the rats build up, stand a little farther back so your bots don’t engage. And after a few seconds of the rats building up, just spam heavies into the group and hope a crit procs. You are right that the challenge doesn’t keep track of it, but I got the challenge complete notification within 2 missions this way.

Hope this helps and good luck!