Ok, so, I’ve taken time to understand the situation!

I will definitely fireball here, as Fire Elemental takes a while to cast!

Fireball, heeyaw!

37 fire damage vs DC 14 Dex

(If you haven't seen a Hook Horror recently: link to image These are "Large", so they are getting in each other's way for attacking the party.)

CON save vs. Quillary's halo of spores DC 15: 3  (It doesn't resolve until next round, but I don't want to forget.)

From the south are 4 more hook horrors. With a giggle of glee, Pascal lobs his prepared Fireball to envelop all of them. DEX saves vs. Pascal's fireball DC 14: 12 , 1 , 18 , 3
HH4, HH5, and HH6 take the full brunt of the blast, which shields HH7 slightly (18 damage).

Two of the hook horrors can attack Jorin. (The other two are stuck behind, and don't have the movement to reach the party.) Four attacks (with Adv. vs. reckless) against Jorin.

• Attack1a: 16 Damage: 7
• Attack1b: 25 Damage: 12
• Attack2a: 16 Damage: 9
• Attack2b: 14 Damage: 10

Drusk was hit (42/52 hp), Hildigrim was hit (49/64 hp), and Jorin was hit 4 times (53/72 hp). Pascal is currently close to the cavern entrance, which makes him a less obvious target (unless he draws more attention to himself).

• HH1 climbed down the rock pillar, and is in melee with Drusk and Quillary. It has taken 18 damage (Hildi's arrow, Q's club and spore halo).
• HH2 is next to Hildigrim and Jorin, and took 30 damage from Jorin.
• HH3 will be able to move into melee range next round. It is closest to Drusk.
• HH4 (37 damage) and HH5 (37 damage) are in melee with Jorin. HH6 (37 damage) and HH7 (18 damage) are behind them, but these things can climb the walls to get around the other hook horrors.

Next round...

Drusk will use a bonus action to cast Spiritual Weapon. Then he will make a mace attack on HH1.

• Attack: 12 Damage: 9  (miss)
• SW Attack: 16 Damage: 5  (hit, HH1 at 30 damage total)

Hildigrim is up. (Then HH1, HH2, and HH3.)

Jorin howls in excitement as Pascal's fireball goes off, backlighting his savage attacks on the monstrosity next to him like a sweet 80s action movie.

Hildigrim is regretting his boldness in entering the chamber first. He disengages (bonus) from the horrors near him and hurries toward Pascal. Volo jumps off of his shoulder and flutters crazily to land on a rock high out of the fray, but ready to create a distraction if so needed. As he moves by, the halfling fires an arrow at HH1.

+1 shortbow attack: 10; damage: 8 piercing damage

Sneak attack: 9

Hildigrim is able to do 24 damage with his arrow striking the head of HH1 (54 damage total). It is definitely wounded, but still very active.

HH1 and HH3 are attacking Drusk.

• Attack1a: 7 Damage: 13  (miss)
• Attack1b: 15 Damage: 12  (miss)
• Attack3a: 19 Damage: 10  (miss)
• Attack3b: 22 Damage: 14  (critical)

HH2 strikes at Jorin (with Advantage due to reckless). Jorin is surrounded by HH2, HH4, and HH5.

• Attack: 24 Damage: 8  (hit, 5 damage after rage)
• Attack: 24 Damage: 13  (hit, 5 damage)

Jorin, Pascal, and Quillary are up. (Then HH4-7 go.) At the moment, Pascal can still get the 4 hooked horrors to the south with a fireball, without getting Jorin.

Jorin whirls around, striking first at HH4 and then at HH5 if is first foe falls from any of his blows!

• Action: (Non reckless) Battle Axe Attacks!
  • First Attack: 18 Damage: 10
  • Second Attack: 30 Damage: 20
• Bonus Action:  Moonblade attack! Attack: 28 Damage: 12
• +3 radiant damage to the first blow that lands

Quillary tries to assess the battleground. How many hooked horrors could she catch with Faerie Fire, without catching any friendlies? (within a 20' cube, which can be up to 60' away) The four HH to the south that Pascal could get with a Fireball? The ones in combat nearby?

Quote from Mingofaust >>

How many hooked horrors could she catch with Faerie Fire, without catching any friendlies? (within a 20' cube, which can be up to 60' away) The four HH to the south that Pascal could get with a Fireball? The ones in combat nearby?

(She can get the 4 to the south (HH4-7), who are bunched up at the moment. She can just get all 3 of the earlier initiative group (HH1-3). Or she could get HH2 and HH4, missing a third one outside the 20' cube.)

Quillary casts Faerie Fire on the first three (HH1-3). Dex Save vs DC 15.

Jorin hits HH4 twice (the 12 missed) doing 28 damage (65 total). It is in bad shape, but still up.

Faerie Fire DEX saves: 19 , 20 ,  6  (sheesh) Only the undamaged HH3 is lit up.

Pascal is up.

Pascal conjures a bolt of fire towards the one that has fairy fire!

Attack: 25 Damage: 12 fire!

(OOC: It is getting too complicated without a map.)

Pascal hits HH3. Now all 7 hook horrors are damaged. (But the party is still being attacked by 7 of them.)

HH6 and HH7 climb the wall (to get past HH5), move near Pascal and Hildigrim, and climb down to the floor next to them. (This required using their Action for more movement, so no attack this round.)

HH4 and HH5 continue attacking Jorin.

• Attack4a: 17 Damage: 11  (miss)
• Attack4b: 24 Damage: 10  (hit, rage reduced to 7)
• Attack5a: 22 Damage: 14  (hit, rage reduced to 7)
• Attack5b: 16 Damage: 7  (miss)

If I've done the math right, Jorin is now at 29 HP.

Start of a new round...

Drusk will continue attacking H1 (which was also hit earlier by Hildi and Quillary).

• mace Attack: 15 Damage: 10  (hit)
• spiritual weapon Attack: 16 Damage: 11  (hit)

Hildigrim is up. (Then HH1, HH2, and HH3.)

Watching the hook horrors drop around him, Hildigrim steels himself. He calls Volo to his aid and drops his bow at his feet. Drawing both his rapier and a dagger, he asks his owl to fly around H7's head long enough for him to attack before sending his familiar into hiding once again.

Rapier attack with advantage vs. H7: Attack: 22 Damage: 6

Bonus off-hand attack with dagger vs. H7: Attack: 18 Damage: 3

Sneak attack: 14

EDIT: 5 out of 9 rolls were 1s.

(OOC: For future attacks, add "ro1" to your attack roll script, and it will re-roll 1s to account for Halfling Luck. So that rapier to-hit could have been "1d20adro1")

Hook Horrors have AC 15, so Hildigrim only does 11 damage to HH7 instead of 12. (Yeah, the die-roller was not kind.)

HH1 and HH3 attack Drusk.

• Attack: 26 Damage: 20  (hit)
• Attack: 14 Damage: 13  (missed)
• Attack: 9 Damage: 10  (hit)
• Attack: 10 Damage: 10  (just missed)

HH2 attacks Jorin.

• Attack: 7 Damage: 8  (hit, rage reduced to 7)
• Attack: 14 Damage: 11  (hit, rage reduced to 6)

Jorin, Pascal, and Quillary are up. (Then HH4-HH7 go.)

(OOC: Drusk is down to 3 HP, and Jorin to 16 HP. Drusk will do healing his next turn, so don't worry about him.

He will suggest concentrating damage. Right now, the party is spreading out the damage pretty evenly among the enemies. HH4 is the most damaged, followed by HH1. And HH3 is lit up with Faerie Fire.)

"Stop hitting my friends!" Quillary shouts, and as she does, her body begins to change, growing taller... darker... barkier. Her hair may have more leaves in it than it usually does, but that's hard to tell, and roots grow up out of the ground around her. But she swings her club at H1, putting all her anger into the swing. Her spores lash out, too.

• Bonus Action: cast Guardian of Nature (Great Tree) = +10 temp hp, ground within 15' is difficult Terran for enemies, adv on Con saves, adv on Dex or Wis attacks.
• Action: Swing magicked club at H1. 25 to hit, for 11 magic bludgeoning damage
• Reaction: Spores swarm H1 (or H3 if H1 is dead), and on the monster's turn, Con Save vs DC 15 or take 4 necrotic damage

Ugh, unfortunately Jorin cannot get to either H1 or H3.

Jorin heaves under the weight of his injuries and says, "We must concentrate our attacks!  A single spear driven with five hands cuts deeper than five spears driven by a single hand."  He then roars, spraying blood into the face of HH4.

• Movement:  If HH4 is killed by any of these blows (except the last one), he will move west and north to be within melee range of HH3, taking an AoO from HH5 in the process.
• Action: Reckless Battleaxe
  • First Attack: 24 Damage: 17
  • Second Attack: 28 Damage: 15
• Bonus Action: Moonblade Attack: 22 Damage: 14
  
• +3 radiant damage added to the first blow that lands
• ACTION SURGE
  • Action: MOAR Battleaxe
    • First Attack: 24 Damage: 12
    • Second Attack: 29 Damage: 16

Any remaining attacks will go onto HH3 if HH4 dies and if Jorin isn't killed by the AoOs, lol

Pascal will fire a firebolt towards the very same one fighting Jorin!

Attack: 25 Damage: 17 fire damage!

Quillary bashes HH1 with her magic-enhanced might for 11 damage. It is hurt (below half health), but still very active. She also sends a swarm of spores at it (which I will resolve now).

• HH1 CON save vs. DC 15: 19  (fails, takes another 4 necrotic damage)

Jorin.... (this is going to take some writing)

His first battleaxe swing does 20 points, splattering HH4 like a big bug on a car windshield. (HH4 dead). He circles around HH2 to reach HH3. This gives HH5 an AoO (with advantage from reckless).

• Attack: 24 Damage: 11  (misses) Jorin slaps aside the hook arm.

With his action surge, he hits HH3 with 4 more strikes, for a total of 57 damage. Combined with Pascal's earlier fire bolt, it has taken 67 damage. Badly hurt, but still active.

Normally, Pascal would be at disadvantage using a ranged spell attack while other foes are next to him (both HH6 and HH7), but he is aiming at the faerie fire of HH3. (Adv and Disadv. cancel.) His fire bolt blasts HH3, and its glowing body slumps dead.

Resolving HH5-7, at the end of initiative.

What does HH5 do? 13  It wipes the remains of HH4 off its face, screeches at Jorin's back, and then flees to the south. It can no longer be seen as it rounds the corner of the cavern.

HH6 attacks Pascal.

• Attack: 18 Damage: 9  (miss)
• Attack: 19 Damage: 10  (hit)

HH7 attacks Hildigrim.

• Attack: 18 Damage: 14  (just misses)
• Attack: 8 Damage: 14  (miss)

Start of a new round...

Drusk will use his BA to have the spiritual weapon attack HH1.

• Attack: 10 Damage: 9  (hits for max damage)

For his Action, he will Channel Divinity, restoring 20 of his HP, and healing 15 for Jorin. 

Party hit point status:  Drusk 23/52, Hildigrim 49/64, Jorin 31/72, Pascal 45/58, Quillary 45/45 (+ temp hp)

HH3 (faerie fire) and HH4 are dead. HH5 (37 damage) ran south, and is out of sight.

HH1 has taken 73 damage (nearly dead), HH2 30 damage, HH6 (37 damage), and HH7 (18 damage) are still active.

Hildigrim is up. (Then HH1 and HH2.)