Taking the opportunity Orianna will slam another attack on the shadow.

Hit: 24

Damage: 12

Dark strikes again with talons.

1st Attack: 16 Damage: 7

(Opportunity attack is a reaction single weapon attack, no extra attacks.)

Orianna brings the club back down on this shadowy humanoid, as Darkwing slashes at it again with his talons; the dark form once again gripping at his body.

Darkwing: Please make a DC 10 Dexterity Saving Throw, taking 3 necrotic damage on a failure.

Dark dexterity save 17

Killian seeing the creature crawl towards the flame again, runs over and picks up the torch so that it wouldn't cause another blast of some sort. "Oh no youre not doing that trick again!" Seeing it trace something into the ground. Can I see what it's writing or drawing? 

 21

For whatever check you decide. 

Sim snatched the club out of the air and brought it down on the creature's outstretched arm as it started to draw in the sand.

Attack: 13  Damage: 4

Leojym continues over to Darnell with Rumble. He places a hand on the halfling's chest and rapidly chants a prayer to Angharradh. Healing energy surges into Darnell's body.

Cure Wounds: 6

As Carnell's eyes open, Leojym will wrap his hand around the dagger's hilt.

Halfling:

At this point, the scribings of the hand appear to have drawn a triangle and a circle within it. The shadowy humanoid seems to spasm somewhat as the torch is taken away by Killian, almost as if it were in pain, while the club comes smashing down on the outstretched arm.

Seeing that it had seemed to be injured  now, Mara will gather her magic and once more try to cast Toll the Dead on the creature once more. The sound of bells filling the area once more as the warlock pointed at the shadowy figure.

toll the dead 11

Dark passes through the air and dives down on the Shadow figure once again making two attacks.

1st Attack: 13 Damage: 7

2nd Attack: 15 Damage: 7

Dexterity roll to move away 18

(It's a Dex check per attack, Darkwing. Both made contact)

The bells continue their ringing for this shadowy figure.
Shadow Humanoid's Wisdom Saving Throw: 20

Darkwing's flurry strikes into its back. The figure is still moving, attempting to etch more lines in the sand.

(Toll The Dead why have you betrayed me!!!!)

Mara curses as it seems like her spell did nothing. She wished she had more spells that she could use while he was prone.

Shadow freezes, seeing that it is not actively trying to attack, maybe it is a spirit trapped wanting to save us from his torment, maybe it is trying to summon more beings like it here.  He doesn't know if he should tell everyone to stop killing a potential clue, or kill the threat before it gets worse.  He just stands there frozen with a look of horror on his face not knowing what to do.

Revived by Eojym's magic, Darnell opens his eyes wide, taking stock of the situation.

Nodding his thanks to Eojym, he jumps up, and rushes over towards the shadowy figure. He tries to bash it with his club, then stabs at it with his "dagger," utilizing the fact that Darkwing is flanking the shadow.

Club: Attack: 21 Damage: 3

Dagger: Attack: 22 Damage: 10

I forgot advantage. Here's for the first and second attacks, respectively: 16 and 25

Dexterity saving throw on second attack 8

After taking necrotic damage, Dark flies to get distance from the shadow and avoid more damage.

Knowing that whatever this creature could be drawing might possibly knock the wind out of him again, Sim brushes the sand away from the creature's hand to clear away the drawing. After the sand had been cleared, he tried to make sure the creature could no longer draw by crushing its fingers with the club. 

Attack: 23  Damage: 5

The is a panelling of attacks onto the shadow humanoid by the group, the shadow collapses to the ground, unmoving. After a couple of seconds, the grey dimmer light of the torch begins to regain its colour and flickers to its full brightness of a reddish-yellow flame. Simmeat has brushed away the lines traced by the figure, so they are no longer viewable.

(Just to note Darnell, if you make an off-hand attack with a light weapon, such as the dagger, you do not get to add the ability modifier to the damage roll unless it is a negative. You would require the Two-Weapon Fighting Style to be able to do so)

The party gains 45 xp (Total XP gained: 95) for defeating the shadowy humanoid, as his essence seems to slowly seep into the ground. The room goes eerily quiet again, only the sounds of the group's heavy breathing can be heard.

As the party is regaining its breath, Killian notices something...

Mara seeing that her torch has returned to normal will consider picking it up but after the creature she will instead leave it on the ground in case anymore of the shadows attack. "Well that as unpleasant to say the least. Does anyone else think that itmwould be wise to continue on our way before anymore such creatures attempt to attack us?"

Killian, holding the torch Mara dropped as he watches the flame regain its natural color, sees the two "leaf stones" where the body had laid just poking out of the sand. "Aye take a look at this" he hands the torch Mara dropped back to her, because im holding two torches, bends over and picks up the two stones inspecting each one. "They're not beads like the last time but looks like leafs of some sort." I'll say out loud ::If the check fails below a 8 I'll pass the leaf stones to our dwarf to see if he can tell if it is the same type of stone as the ground is made of. Otherwise I put them in the pouch carefully with the 3 beads::

Intelligence check 16 (all my Intelligence based checks are +1)

Sorry, to clarify, this sapling is merged with the floor. It has two small leaves sprouting from it, still part of the ground.