Dog exits the darkness and ends his movement while trying to make C and D line up for a shot with the javelin of lightning. He uses the clockwork amulet to make the attack an automatic 18, and on a failed DEX 13 saving throw, take 10 lightning damage, and the one at the end, assuming it's a hit, takes 9 damage. 

He uses his bonus action to recall the javelin to his hand, using weapon bond, and throws it again, as a normal javelin, this time at A.

Extra Attack: 25 Damage: 6

"Cowards! Are you afraid to take on a goliath?!" he roars, transparently trying to draw their attention away from his friends.

Quote from rkmobius >>

Dog exits the darkness and ends his movement while trying to make C and D line up for a shot with the javelin of lightning. He uses the clockwork amulet to make the attack an automatic 18, and on a failed DEX 13 saving throw, take 15 lightning damage, and the one at the end, assuming it's a hit, takes 6 damage. 

He uses his bonus action to recall the javelin to his hand, using weapon bond, and throws it again, as a normal javelin, this time at A.

Extra Attack: 22 Damage: 10

"Cowards! Are you afraid to take on a goliath?!" he roars, transparently trying to draw their attention away from his friends.

"Make a ranged weapon attack against the target. On a hit, the target takes damage from the javelin plus 4d6 lightning damage."

Javelin Attack: 17 Damage: 19

 Since it is a crit, here's another 4 damage for ya.

DEX(13) check for Assassin D: 21

The javelin blasts through assassin C, causing him to convulse wildly before falling to the ground in a steaming heap, utterly dead.

Assassin D is grazed by the javelin's charge as he dodges out of the way and assassin A takes the javelin in the bicep.

(Althus is up!)

Oh, and since I did it a fumble roll before, let's do a critical hit roll! 76 (You knock the target prone. Well, duh!)

So it's assassins A, B and D against Tock, Althus, Dog and Martin? And D is the leader (Dvarik or something?)

Quote from Winenose >>

So it's assassins A, B and D against Tock, Althus, Dog and Martin? And D is the leader (Dvarik or something?)

Pretty much

Gash fires off another bolt at the assassin

Fire Bolt Attack: 21 Damage: 13

If that doesn't take him out Gash will try and slam the sphere only into the assassin and move it back away. 7 fire

Althus reaches out one of his crab claws to try and grab Assassin B. If he's successful, he'll drag him over to Assassin A, before swinging his longsword at the prone target. Otherwise, he'll swing at B instead.

Grapple: 24

Attack: 28 Damage: 16

Advantage attack: 9

Divine Smite level 2, because I saw a crit: 29

Quote from YoFizz >>

Gash fires off another bolt at the assassin

Fire Bolt Attack: 17 Damage: 10

If that doesn't take him out Gash will try and slam the sphere only into the assassin and move it back away. 9 fire

Gash's fire bolt splashes against the wall. (DEX(15): 20) In a stunning acrobatic feat, the assassin runs his feet up the wall to also dodge the flame sphere as it zooms in and away.

(Bulwark is up!)

Quote from Persuasion >>

Althus reaches out one of his crab claws to try and grab Assassin B. If he's successful, he'll drag him over to Assassin A, before swinging his longsword at the prone target. Otherwise, he'll swing at B instead.

Grapple: 24

Attack: 28 Damage: 16

Advantage attack: 9

Divine Smite level 2, because I saw a crit: 29

DEX(24) check: 12

(Assassin A didn't fall prone, I'm afraid. It doesn't matter, though, because your first roll was the crit!)

Althus drags one assassin through the hedge, ripping the bush apart as he does so. Then, in a fantastically brutal strike, sends the other assassin flying to the ground with a sickening crunch. She does not stand up again. (Crit table roll: 34)

Assassin B slashes at Althus in a desperate attempt to kill him in order to free himself.

Short sword Attack: 13 Damage: 16

Short sword Attack: 10 Damage: 13

Neither strike pierces the paladin's armor.

(Tock and Martin are up.)

Martin moves to where he can shoot at B.

Attack: 14 Damage: 12

Attack: 29 Damage: 11

The ranger limps forward a little, getting a clear line of sight on the assassin in Althus' grasp. Martin's shots strike home, causing a stifled cry of anguish but the assassin does not go limp.

(Tock is up!)

(I halve all Piercing, Bludgeoning, and Slashing damage as well, so maybe just halve every part of the attack? It's tricky trying to pick out which parts of that I need to halve and which I don't.)

Bulwark again brings his warhammer down twice onto the assassin recklessly, though trying his best to reign in his attacks so as to knock them unconsious.

Attack: 19 Damage: 8

Attack: 26 Damage: Unable to parse dice roll.

Quote from Cytonus >>

(I halve all Piercing, Bludgeoning, and Slashing damage as well, so maybe just halve every part of the attack? It's tricky trying to pick out which parts of that I need to halve and which I don't.)

Bulwark again brings his warhammer down twice onto the assassin recklessly, though trying his best to reign in his attacks so as to knock them unconsious.

Attack: 26 Damage: 11

Attack: 16 Damage: 8

(D'oh! Right. I'll go back and refigure where Bulwark is at.)

The first blow hits, but the second strikes thin air.

The assassin scowls and stabs at Bulwark again.

Short sword Attack: 25 Damage: 7 (all damage is halved)

Short sword Attack: 12 Damage: 12.5 (all damage is halved)

(Bulwark and Gash are up for round 5)

With those last two hits (ouch!), I have recalculated Bulwark to be at 31 HP having suffered 77 damage and gaining 10 back.

Tock turns to D and says, "Grovel", casting command. WIS(14) save.

Then moves back behind a bush and hides (stealth check: 24)

WIS(14): 8

Gash fires off another bolt of fire at the assassin

Fire Bolt Attack: 25 Damage: 14

If Bulwark is still grappling, I will slam the sphere into the assassin and move it but if not I will just slam it into him and keep it there. Slam Damage! 8 fire Dex save 15 for half

(Elemental Adept Fire makes that 7 an 8)

did you finish the campaign