"They trap you in a web and cover you in slime before they eat you."

Stickyworms are mentioned in How to Steal a Dragon's Sword when Fishlegs asked Hiccup what dragons they were likely to meet in the dungeons at Flashburn's School of Swordfighting. In fact, they found Flashburn hanging upside down in one.

They trap you in a web and cover you in slime before they eat you.

They are incredibly hard to defeat.

armed with:.............slime 10

defenses:...............see above 10

fear factor:...........incredibly hard to defeat 10