Defeat GumGum, Smarsh!

A raging gum gum sprints across the cavern into the murky shallow pool. He pulls out his javelin and curls it high, piercing the slimy hide of the colossal worm which cries out in pain. Smarsh needs to make a constitution saving throw. Bart takes a quick survey of the cavern, and perhaps at the side of the surroundings to like tights, gets the idea to fling his own blanket of daggers onto Smarsh's skull. The spinning blades pepper the crown of the worm, as he flails in frustration confused by the shower of spikes.