Assuming that works, Petcan will cast faerie fire over the invisible thing covered in spiders

DC 16 dex save

Quote from Stormbringer4729 >>

Tempe summons 8 giant(medium sized) wolf spiders above the invisible one.

 

"Even if my friends are ineffective, aim near the spiders they have blindsight." 

(Great plan. I love it)

Invisible Thing's DEX save: 22

The Invisible Thing slams itself into Zenodor and then into Tempe.

Attack: 16 Damage: 10 bludgeoning damage.

Attack: 23 Damage: 14 bludgeoning damage.

(Randall is up. Pepin is next.)

Randall:

Moving over to another hole, Randall plugs it with candle chunk and wedges it in with a nearby hand axe haft.  He looks over to the strange combat and sends a spectral mace at the invisible creature.

Spiritual Weapon attack with disadvantage:  22

add Bless:  1

Damage if it hits:  9

Con save 13 gl  Wisdom save 22

I suppose the attacks were in order?

(ooc: Yes, the two slam attacks were in order... what is the WIS save for?)

(Ooc: To keep concentration on my spell.)

Quote from Brian_Avery >>

The Invisible Thing slams itself into Zenodor and then into Tempe.

Attack: 20 Damage: 8 bludgeoning damage.

Attack: 26 Damage: 15 bludgeoning damage.

(Randall is up. Pepin is next.)

 Z is hit, and takes some damage. However, the 'thing' also takes 25 Cold Damage from Armor of Agathys - which I think also means a saving if the thing is using concentration on some sort of invisibility spell.

(ooc: concentration saves are CON saves but the actual roll still beats the DC of 10 so you don't lose the spiders.)

(ooc: thanks for the reminder on the 25 cold damage... another saving throw for what?)

(at higher levels with so much going on behind the scenes I sometimes lose track of things, if I ask questions or ask for reminders please don't take it the wrong way and allow for the most positive benefit of the doubt possible.)

Quote from Brian_Avery >>

(ooc: thanks for the reminder on the 25 cold damage... another saving throw for what?)

 (I was thinking/hoping the Thing might be concentrating on an Invisibility spell.)

Pepin will focus on plugging holes while the thing remains invisible. Using his hammer to wedge it right in. 

Round 1 Recap:

Zenodor plugs a hole, and so does Irraxan.

Tempe summons 8 spiders just above the Invisible Thing and they drop down upon it, biting where they can. Pinky plugs a hole.

Petcan casts Faerie Fire but it doesn't take hold on the Invisible Thing.

Invisible Thing slams into Zenodor and also solidly into Tempe.

Randall plugs a hole and summons a spiritual weapon, directing it to strike the Invisible Thing.

Pepin plugs a hole.

6 of the 12 holes are plugged. The water level is mid calf and has been slowed by half from filling up the chamber.

Round 2

Initiative Order:

Zenodor
Tempe
Petcan
Invisible Stalker
Randall
Pepin

Zenodor asks Irraxan to carry on plugging holes, but feels it's time to go on the offensive 

He shoots bolts of Eldritch energy at the thing that just slammed into him (3 bolts, each with disadvantage as he can only see the disturbed water, and as the thing may or may not be too close for undisturbed ranged attack)

EB1 Attack: 17 Damage: 9

EB2 Attack: 14 Damage: 12

EB3 Attack: 18 Damage: 6

OOC:  Recall that everyone has Bless, so that is +1d4 on all saves and attack rolls.

Quote from Touschka_ >>

Zenodor asks Irraxan to carry on plugging holes, but feels it's time to go on the offensive 

He shoots bolts of Eldritch energy at the thing that just slammed into him (3 bolts, each with disadvantage as he can only see the disturbed water, and as the thing may or may not be too close for undisturbed ranged attack)

EB1 Attack: 18 Damage: 11

EB2 Attack: 9 Damage: 12

EB3 Attack: 23 Damage: 5

 First attack bless, add 4

Second add 1

Third add 3

Quote from Scott_R_Simmons >>

OOC:  Recall that everyone has Bless, so that is +1d4 on all saves and attack rolls.

 Thanks. Forgot about this, so added in second post.

Total attack rolls are thus

22, 10 and 26

Tempe produces a ball of fire (produce flame) in his clawed hand and throws it at the invisible assailant: attack Disadvantage 10 fire damage 19 Then moves next to Zendor as Pinky flies above and inbetween He and Z  "Come with Us" Tempe says to Z and Pinky uses his fiery teleport Dex save DC16 6 fire damage. Then Pinky hides behind Tempe. 

"Try to stop it my friends." Tempe says to the Giant wolf spiders

The giant wolf spiders attack climbing the wind (they still do half damage piercing) 

1Attack: 13 Damage: 7 Piercing) DC 11 Constitution saving throw poison damage 9

2Attack: 6 Damage: 5Piercing) DC 11 Constitution saving throw poison damage 4

3Attack: 5 Damage: 6Piercing) DC 11 Constitution saving throw poison damage 4

4 Attack: 4 Damage: 3Piercing) DC 11 Constitution saving throw poison damage 4

5 Attack: 14 Damage: 5Piercing) DC 11 Constitution saving throw poison damage 8

6 Attack: 8 Damage: 2Piercing) DC 11 Constitution saving throw poison damage 7

7 Attack: 7 Damage: 5Piercing) DC 11 Constitution saving throw poison damage 8

8 Attack: 9 Damage: 7Piercing) DC 11 Constitution saving throw poison damage 6

Bless on the produce flame attack 2