The Valley of Ends

No clue what that is, since it is a graphic I cannot access with my software.  As long as the creature and gotch are in the area, I am fine.

Lyrant's vision becomes blocked by the fog cloud, after a moment looking around, She moves back out of the Fog Cloud and Dodge. 

The skeletal serpent takes a moment observing it's obscured surrounds and [Tooltip Not Found]. 

Stealth: 23 (This is surprising)

(Very much so)

If you want to change the action, you may. 

I’m fine with that roll

Next Up 

Raynor - Luaghter?

Onyx - Arrow shot in fog?

Gotch - circling around?

Start of turn

Lyrant - ?

Bone Naga - ?

Onyx holds his action untill he can hear the snake. Once he can locate the beast he will shoot an arrow.

Attack: 9 Damage: 11

Hearing the creature go silent, and figuring it also has tried to be unseen, Gotch moves on through the fog and will continue on out the other side, bypassing the creature completely.

(Do you want another stealth check for the movement or do you use the one I already rolled last round.  I've seen it done both ways, so want to know what you prefer.)

Do I still sense it via detect magic?

If so Raynor will try and cast Tasha’s Hideous Laughter

(pending rule check)if Gotch move only up to half of his movement, we'll use old stealth check but beyond that, need anotehr stealth check.Also what other side? wasn't the cloud creates in midway point between Gotch and the snake?

Raynor can't see the serpent through the magical fog cloud taking up all the magic detection. 

Combat Situation
Onyx, Raynor and maybe Gotch? are within the Fog Cloud created by Gotch with the enemy hiding somewhere within the cloud. While inside the cloud, everyone is basically blinded. (Can revise turns if you want). The edge of the Cloud is about 10ft to your left, right and back. Same applied to Bone Naga when cloud was created.

Lyrant moved back out of the cloud and is lookout for attacks. 

The Bone Naga was between the party and the artifact and 40ft pillar of dim light it's creating. (the light isn't enough to disperate Fog Cloud's cover). 

Is the Bone Naga within 30ft of me now? I don’t have to see it

Bone Naga's location is unknown, it hid. 

Last time it was seen before Fog Cloud, it was 60ft away from the group. every square on image is 5ft for reference. 

Last turn, Lyrant stepped backward, out of the fog cloud.

Okay then Lyrant’s action will be Faerie Fire. She sends it to a point 40ft in the direction of the Bone Naga’s original spot.

If it is within 20ft of that point, it must pass a DC 12 dex save. If it fails, all attack rolls against it have advantage for the next minute.

However, if anyone else is in that 20ft cube, they also have to roll.

Dex Save: 12 (This is getting ridiculous)

Lyrant  causes the area the serpent was seen to glow for a moment. the party needs the movements of the boney serpent as it seems to evade the lights. From within the fog cloud, the ground shifts out of the way as the serpent moves but where is hard to tell.

Bone Naga moved full movement and hides again

Stealth: 14

Back to everyone.

Turn order
Raynor - readied knife
Onyx - educated shot
Gotch - investigation of artifact
Lyrant

My passive perception is higher then 10 (15 i think) so i assume Onyx has a general idea where the Naga is at the moment.

he shoots an arrow

Attack: 14 Damage: 8

and them he moves towards 4 o‘clock in the fog cloud.

Last round gotch was moving full speed so will do stealth check...

Stealth:  25

Should have moved 60 feet straight ahead, so would bring him to the very edge of the fog, behind the bone creature's first position.  Closer to the artifact that the bone creature if it stayed inside the fog.

Assuming the bone creature has a passive perception less than 25, Gotch would be completely unnoticed as he reaches the edge of the fog.  he would also now know the location of the naga, as his passive perception is more than 10.  With this,he will continue onward, moving directly towards the artifact.

Pulling his cooking knife Raynor will back up (trying to get out of the cloud) and hold an attack if the bone snake gets close to him

Gotch will easily arrive the edge of the light pillar with movement to spare, about 20ft of regular movement left. Within the liquid, there's are several corpses, submerged in the liquid that been pushed to the edge.

Wish to walk through the liquid? It would be difficult terrian as it's like moving against the tide.

Passive perception vs stealth for now, gives you general idea of where he is but not pinpoint

Is there any land ahead, like an island or something?

Gotch tries to figure out what the liquid is and what the light is from, or anything else he can about the area ahead of him...

Arcana:  9

Nature:  11

Gotch identifies the liquid as 'Moonfire'. A magical substance created by Selune clergy during ritual normally. Can be used to enchance and create magic items but very dangerous to touch with bare skin, scales or bodies. There are no islands or landmasses among the 40ft circle of moonfire that seems to disappear at the edge rather like it can't exist among this range or is being contained within it. Judging from the edge, the liquid is at least ankle deep at the edge for a human, maybe almost knee deep for a goblin such as yourself.