Two more arrows slam into the crystal flying ship holding the starfish dude.  Two more cracks appear on its surface, though Grenk feels his arrows are having a reduced effect on its hard crystal surface. 

Badger? 

Badger moves 30' back down the corridor to Sickle and accepts the healing. His gratitude makes room for pity and he reassures Sickle: Powerful magic can be difficult to control. You're doing a fine job of it for the most part. Let's go. He will then Dash to move another 15' down the hall, stopping 15' from the shaft.

The cubes above fly a bit closer (now only 140 feet up) as they continue to rain down arrows, now on only two targets out on the ledge: 

Silas :  Attack: 15 Damage: 3 Attack: 9 Damage: 7 Attack: 13 Damage: 6 Attack: 17 Damage: 6 Attack: 10 Damage: 8 

Grenk: Attack: 21 Damage: 5 Attack: 6 Damage: 4 Attack: 21 Damage: 4 Attack: 6 Damage: 3

A rain of arrows clatters around the two still out on the balcony.

Silas, Mal, Sickle, you're all up. 

Starfish in a floating crystal is 80 feet up. The other guys are 140 feet up.  Silas, your grappling hook is attached to the far ledge. 

Initiative: [Mal: 22, Sickle/Wolf: 19, Starfish: 17, Badger: 13, Grenk: 12, Cubes: 12, Silas: 8]

Mal will move back down the corridor again just enough to see any of the flying creatures and take some shots at it then duck back down the hallway.

Heavy Crossbow: Attack: 27 Damage: 13

Heavy Crossbow: Attack: 11 Damage: 11

Silas looks at the wings descend but determining they're out of range for him, he'll take his end of the rope, find a anchor point and just focus on getting to the other side platform. He'll cast healing word for a top up on himself before attempting to start the climb across. 

Healing: 6

Athletics: 15

Silas heals himself and then clambers over the gap using his rope, lifting himself over the edge and up onto the upper balcony.  (he's now 15 feet closer to the enemies descending the shaft). 

From here, he can see a small crawlway.  It's appears 3 feet high and 3 feet wide and seems to run for 20 feet before opening into another room. 

Mal fires an arrow up, striking the injured flying cube....the arrow rips through it and it disintegrates. 

Sickle? 

Sickle will move back to the opening and throw an Ice Knife into the crystal encased starfish creature. (3rd Level)

Attack: 26 Damage: 3

DEX Save DC 16 in 5ft from impact or 9 cold damage

(Good call, was thinking Ice Knife was a base 2nd level). Additional Cold Damage: 1

Sickle, you get 1 more d6 to roll. yay more damage

The ice knife shatters across the crystal ship carrying the starfish guy, sending ice crystals splatter across the crystal and leaving another crack in it. 

The Starfish in the crystal descends another 50 feet, now only 15 feet above Silas, and 30 feet above the others. The cubes are still at 140 feet. 

Badger, Grenk?

Initiative: [Mal: 22, Sickle/Wolf: 19, Starfish: 17, Badger: 13, Grenk: 12, Cubes: 12, Silas: 8]

Badger pokes his head out again, seeing the crystal vehicle floating nearby and the cubes far beyond. Wanting the danger to be gone and also craving a little warmth to allay the residual effects of the ice blast, Badger prepares to cast a fireball at the crystal vehicle. Then at the last moment he ponders whether it would be possible to hijack the thing, and in a snap decision he aims his fireball at the cube creatures.

Fireball at 5th level, aimed at the center of the group of cube-creatures, doing 41 fire damage, or DC 17 DEX save for half.

Grenk flinched for a moment as the fireball exploded.  He wasn't expecting that but smiled as it was a solid idea.  That soon turned to a frown knowing all he could do at the moment t was ineffectually shoot arrows.  He continued to do so.

Attack: 16 Damage: 12 + 5 poison 

Attack: 21 Damage: 5 + 5 poison 

13 8 20 18 3 7 19 16 

The sudden eruption of fire up the column surprises everyone, as the spell erupts at its furthest possible distance, filling the space with fire.  When the flame clears, only 3 of the cube creatures remain, the others having been incinerated into nothing.  

What is Grenk shooting at? 

Sorry, still shooting at the star creature.

The first of Grenk's arrows clatters off of the crystal ship harmlessly, but the 2nd one hits pretty solidly, cracking the crystal a tiny bit. 

The three cubes that are left flying descend another 30 feet and fire arrows into the group. 

Grenk: Attack: 11 Damage: 8

Badger: Attack: 5 Damage: 3

Silas: Attack: 11 Damage: Unable to parse dice roll.

Silas, Mal, Sickle, your turns.

Silas checks his surrounds if there's a way out before turning towards one of the remaining cubes and letting off a Guiding Bolt. 

Attack: 18 Damage: 14

The bolt strikes one of the cubes and its disintegrates as the bolt slams into it. 

Mal, Sickle?

Sickle feels incredibly disjointed, desperately trying to think of a spell that will take care of these creatures, fighting the urge to use the ring again, until at last, the urge overtakes him, and he casts Arcane Hand from the ring and sends the icy hand to grapple the crystal-encased starfish. (Grasping Hand, STR Check: 28)

Mal again slinks down the hallway till she can see one of the enemies and shoots at it twice with her heavy crossbow.

Crossbow: Attack: 29 Damage: 13

Crossbow: Attack: 16 Damage: 13

Sneak Attack if I get it: 5

Then she will move back down the hallway to get out of site.

Mals crossbow rips through another one, and it disintegrates. A huge icy hand appears in mid air, and grasps the crystal ship, halting its progress, as it struggles to move against its icy grasp. 

The starfish seems to manipulate something inside the crystal ship and a small hole appears in one panel that’s facing down towards Silas. The starfish then puts its mouth against the hole and a spray of poisonous mist comes shooting out surrounding Silas.  It then quickly pushes something and the hole vanishes. 

DC 11 con save please Silas. 

Badger, Grenk?

Initiative: [Mal: 22, Sickle/Wolf: 19, Starfish: 17, Badger: 13, Grenk: 12, Cubes: 12, Silas: 8]

Grenk is not enjoying this.  He dislikes creatures that shrug off his attacks. He takes two more shots with poisoned arrows at the star fish and as the arrows sail he will hit the creature with a curse of exposure.

Attack: 18 Damage: 9 + 5 poison 

Attack: 15 Damage: 7 + 4 poison 

Will move as close as he can if he can get within 30 feet.  If not he will stay put.

If he can get within 30 feet and one of the arrows hits, will use curse of exposure.

When a creature you can see within 30 feet is hit by an attack or spell, you can use your reaction to temporarily weaken their resilience against it. Until the end of the turn, the target loses resistance to the damage types of the triggering attack or spell.

If the ship is restrained we get advantage on attacks.  Here are those two rolls 14, 26