The guards see the gigantic worm and panic, the majority of them fleeing as quickly as they came.   All but one.  A gruff looking dark-haired human sets her halberd and charges!

Attack : 11 Damage : 10  (or 10)

Bonus Attack: 11 Damage 6 (or 3)

The Guard hits both times.

Vanja yells "Woohoo! Let's go!" and looses two arrows at the worm. She then closes her eyes and draws a deep breath, taking an Action Surge to shoot two more arrows at the worm.

Attack1 : 19 Damage: 11

Attack2: 9 Damage: 8

Attack3: 20 Damage: 8

Attack4: 15 Damage: 12

Vanja learns the creature has an 18 AC.  She has hit it for 5 & 11 hp of damage.

Ravager is next up then the worm.

Ravage casts Vampiric Touch.

26  to hit

15  if she hits

She recovers 7 hp

1-3 The guardsman, 4-6 Ravager   (1d6): 5

The worm tries to eat Ravager!  Attack 27 Damage: 34

Ravager is mauled badly but not swallowed. 

Guile and Aegnor are up next.

Arnel shoots twice at the worm.  

1st shot: 22 Damage: 13

2nd shot: 31 Damage: 10

The elf then moves up to Ravager's prone body and starts pulling her away (he has a haste spell on him.)

posted in OOC

Guile sends his flaming sphere into the worm.  DC 16 Dex or 9 fire

Guile shouts to the guards, "Release some animals to distract it."  Soon I'll unlock the grimoire to call upon the servents of Abyss he thinks.

The hobgoblin tactician moves towards any nearby animals, while keeping 80' from the worm.  He positions himself for his subsequent action, while drawing forth and hurling a Gelugon frost orb at the giant worm.

 Attack: 24 Damage: 17 cold

Aegnor  

MOVE: Aegnor moves to place distance between him and the worm while still being able to attack it up to 30 ft; (spending 30 feet of movement; first diagonal costs 5 ft. of movement, second costs 10 ft., third costs 5 ft., etc.)
BONUS: Commands Skelly and Shadow to attack with advantage from Pack tactics:
ACTION: Cast Eldritch Blast,  Eldritch #1 Attack the Worm: 12! Damage: 11 Eldritch #2 Attack the worm or next available target: 19! Damage: 8

Shadow’s pact tactics moves up to 50ft Attack the Worm:  13! Damage: 11   :Roll DC 13 STR or be knocked prone

Aegnor has Skelly attack.

Skelly Atk: 5;  Dmg 8

End of turn!

Reaction:  Opportunity attack if it presents itself or spells

Worm's dex save: 7 vs flaming sphere

Guile's sphere burns the Giant Worm then the spell freezes it!

Aegnor attacks bounce of the worm's hide. (I'm ruling that it is too big to knock down,  2 sizes larger or greater is immune to that type of prone inducing attack ).

Guard                           20

Vanja                            14

Ravager                        13

Worm                            13

Guile                                9

Arnel                               8

Aegnor                            7

The guard strikes again!

9 damage: 9 halberd

25 damage: 4 other end.

Vanja is up next

Vanja yells "This one is tough!" and prepares to shoot.

Attack1: 11 Damage: 7

Attack2: 11 Damage: 10

If one hits, she will make a Goading Attack - add 4 damage

(the target must make a WIS saving throw (DC 15). On failure, the target has disadvantage on all attack rolls against targets other than you until the end of your next turn)

The worm attacks the Guard!  15 Damage: 26

The guard staggers from the crushing blow, sprawls unconscious upon the ground.