Sure, Mud's turn.

Ok, bonus action to cast hex, then action to use booming blade.  Attack: 16 Damage: 11 and you're pushed 5 feet away.  Then I'll move 30 feet away.

Never mind on the movement, don;t want to incur an opportunity attack.  That was assuming I had hit.

Gwathren swings his blade down in a mighty arc, following up with a elbow smash and kick to the knee.

Attack: 23 Damage: 7

bonus action ki spent for flurry of blows

Attack: 25 Damage: 7

Attack: 23 Damage: 5

Note, longsword damage should use his dex bonus as a monk weapon, so should be +3 instead of +2.  Both previous attack and first attack here should have one more damage each.

Mud's taken 18 damage.

That's nasty.  Booming blade!

Attack: 17 Damage: 12 And I'll move 30 feet back

(You're pushed 5 feet away)

Yep, 14 damage. I think that's max damage.

No, because of hex, max damage is 18.

Oh, that makes sense.

Oh, and hex lets you give him disadvantage on a type of check. Choose, if you wish.

Oh, yeah.  I always forget about that part of the spell.  Umm... Strength.

Sudden Revelation:

That could be helpful!

Rogue takes magic initiate :)

Rogue takes fire bolt(for range), booming blade(for melee), and hex.

Rogue will hex enemy. Wisdom disadvantage! 

Rogue can easily hide!

Rogue smart! + extra damage!

That, and: https://www.skullsplitterdice.com/blogs/dnd/warlock-rogue-5e-multiclass-guide

I just realized that I forgot to add damage from dueling, so that's actually 16 damage.

And you said I've taken 18 damage, but my AC is 18, so I've actually only taken 13.

huh, ok.

Gwathren will take hold his position, ignoring the energy surrounding him and taking a deep breath.

Dodge Action

Bonus Action Second Wind for 7 hit points

I'll back up another 10 feet, then hurl the javelin, activating its lightning power.

Attack: 12 Damage: 63