Know Your Roll

The gang begins their battle against a grotesque mutant worm in the mines outside of Secomber. Fess taps into his magic with chaotic consequence, unleashing a fireball that endangers the party. The beast unleashes a terrifying roar that leaves the party absolutely Frightened (PHB pg. 290). Jeff finds a creative use for his spellcasting Orb given to him by Engelbert, to spectacular effect. There's no way this battle will last more than 10 rounds...right?