Best challenge to farm Nagas?

I’m trying to grind out the Naga challenge but can’t find a level with more than one or two Nagas. Is there any challenge that has at least 3 or 4?

You can’t get the event gems from challenges @nehoc, only explore and pvp gives them this week.

However on a positive note, there are a lot of PVP teams (almost 2 out of every 3 so far have been nagas)

Also the devs lowered the last task from 300 to 200 stones.

mist of scales serpent nest has 3 nagas

Best spot to kill mechs? Adana challenges?