Underdark Assault: "Chuul me once, Chuul me thrice"

It's never a good idea to split the party especially when it's deep underground, especially in the Underdark! As magic-user Zhenaya wandered off to hear a strange cry in the dark, a strange mist obscured the rest of her companions from her and, with its anomalous property, along with the strange supernatural darkness, somehow separated her from the rest of the party.
Luckily, one of her companions, g'Lurrp the Grung Warrior, tailed her before she could truly feel alone. As they both neared the strange cry, they discovered a small alien-like jellyfish creature called a Flumph, about to attacked by three the horrifying crustacean-like Chuuls. The quick-thinking young mage, promptly used her arcane staff to focus up a spell to shield them from the aberrations, while her Grung companion readies his spear to fend them off. Both companions share the the terrified adorable flumph's fear: How are they going to survive?