Murky vs Artanis
In the beginning Artanis just walks over Murky. Like Anu'barak you have to time your slimes for when Artanis's shields are down. However at level 13 once you get Fish Tank its an even fight and at lvl 16 with Toxic Buildup it turns in Murky's favor.
Be aware that Artanis can get a talent that increaes his attack rate when he uses his swap ability. If so bubble after he uses it to avoid unecessay pain.