Valar nods, "I am ready when you are, let's go find these fiends." 

Draíocht nods in agreement, ready to proceed with the others. And keeping an eye on their back.

Amiz head back to the rope in the shaft and climbs down to the bottom

Athletics with advantage from rope

18

Thelanis follows. Athletics 12

Draíocht Athletics: max(18,2) + 1 + 1(guidance) = 20

You all climb down the rest of the rope. Down here the moonlight stops shining. How are you all handling the darkness? 

Amiz has Darkvision so he should be fine seeing everything in shades of grey. 

Draíocht takes a look at Valar. "I can hold a torch for you if you'd like." he says.

Thelanis lights a torch and holds it with mage hand, recasting every minute.

Valar smiles, "That will do nicely, thanks."

Shifting to the back as they start to head forward, Draíocht keeps an eye out for anything coming from behind.

Perception: 6+5 = 11

Oh that’s a really good point. Is Thelanis scouting ahead of the party? If so go ahead and roll a Stealth and Perception check.

Valar will also hang back, so the light of the torch does not give more away then necessary. 

Thelains takes point, her torch following 30 ft. behind.. Perception: 22, Stealth: 17.

As Thelanis drops to the bottom of the rope and begins to head further along into the mine, something catches her attention about the ground in front. The gravel has been piled up in one particular section in the centre of the narrow path. Possibly to obscure something underneath.

Thelanis lays down her torch and uses her mage hand to investigate the pile of gravel from about 5 ft. away. (Investigation 12 if warranted)

Can you make a Slight of Hand check for the mage hand as well please Thelanis.

[[Feeling like an arcane trickster...]

Slight of hand, dirty 20.

Valar will pick up the torch while the hand is busy

Thalanis manages to brush away some of the dirt and you see a plate protruding from the dungeon floor. A concealed pressure plate.