It rakes its claws across Jasper.

Claws against Jasper - Attack: 24 Damage: 16

It slinks back into the floor, potentially taking more damage from Jasper’s Booming Blade.

Damage from occupying the same space as the earth - 5

Miesha will prepare and hold a Guiding Bolt to be released upon the fiends next appearance...

Guiding Bolt Attack: 24 Damage: 14 Radiant Damage if it hits and the next attack made on the target before end of my next turn has advantage...

Jasper is somehow protected by an invisible shield of arcane energy. He smirks at Maggwyn and raises an eyebrow at the benefits of his newfound magic.

Booming Blade Attack: 20
Weapon Damage: 12
Attack Thunder Damage: 4
Movement Thunder Damage: 11

Crannoc uses his spectral pine needle Spiritual Weapon to strike at the shadowy fiend while it is in the earth once more as a bonus action.

Spiritual Weapon plus Bless to hit:  28 + 2 = 30
Force damage:  6 (minimum for the second turn in a row!).

He feels sick to his stomach at the wrongness of it all.  Unable to do much more, he dodges as an action (attacks against him at disadvantage).

A series of mighty blows, including a bolt of light from Miesha that seemed to do disproportionately massive damage to the shadow, strike the fiend. The shadow writhes as it bursts, dispersing into the shadows around you. The space around you is very still. Ahead of you a little ways, you see another intersection, this time with three ways you could delve.

Crannoc feels better as the shadow vanishes, though only slightly.  Repressing a gag reflex, he manages:  "Well struck, bronze warrior."

Keeping his Spiritual Weapon and Bless active for 48 and 42 more seconds, he proceeds quietly to look and listen down each path.

Crannoc Perception (no Guidance as he is concentrating on Bless):  16

     "The radiance is glorious, I just am able to unleash it once in a while," Miesha responds to Crannoc.  "Do we have any idea what we are looking for down here?  I could try to detect monsters such as this a few more times but I suspect if they're all we are looking for that they'll find us anyway if we stay down here."

"Treasure" replies Jasper with a twinkle in his eye as he ignores Crannoc's true purpose here.

     Miesha looks at Jasper curiously for a moment.  "And can you sniff out the treasure?" she asks, unsure of just what the cat-man could or couldn't do.

Maggwyn smirks a bit at Miesha's question.  "Yeah, I swear he can.  Just watch."

Crannoc is slightly taken aback by Jasper's answer to Miesha's question.

"I suppose there are many forms of treasure, cat-man, physical and spiritual.  Perhaps you will find the one you seek.  I honestly hope so.  As for me, I... I wish I knew better.  Some foul being has poisoned this land, stabbing it with a shadowy weapon that I could not name.  I have... dreamt it, as I said.  I thought for a moment that the fiend which attacked us just now might be the one.  But now... I do not think so.  I think we may find them here yet, further somewhere within these tunnels, and if so, I hope to end them."

(See above Perception check.  If no new information, Crannoc suggests continuing to proceed left.)

Based on what you've seen of the tunnels, you could either go back and go the other direction from the previous intersection or you could proceed to the next intersection and go one of three ways.

Crannoc - Surveilling the area, you hear something in a brief moment of silence. There's a shuffling sound further down the tunnel.

     "May as well keep heading in the same direction til we need to choose otherwise," Miesha suggests and starts to make it so...

Crannoc grunts uncharacteristically and follows.  "I heard a brief shuffling noise further ahead...."

He subsides, feeling too ill to speak further.  His Bless and Spiritual Weapon fade away into the darkness.

He does continue to cast Guidance on himself, reaching out for some connection to Temuth to bolster his flagging spirits.

Progressing further ahead, the shuffling sounds get louder. At the intersection, Crannoc is able to make out that the sound is coming from the right, but there is also the sound trickling water coming from the left.

Crannoc mutters, sounding hoarse.

"Shuffling noise is to the right, trickling water to the left.  Strange. I don't remember any water nearby above.  Someone else please choose our direction.  Be careful.  Things are so foul down here that I... I am struggling, Temuth help me."

"Shadowy weapon, you say?" Jasper looks intrigued. Regarding sniffing out treasure Jasper looks to Miesha and Maggwyn and says "of course!"

"Apprentice, perhaps you should draw a map of where we've been so we can get out of here with the goods."

Crannoc - After you utter the name "Temuth" the shuffling stops.

There is silence all around except for the trickling of water. You hear loud steps thundering through the tunnel to the right. A massive horned bull creature charges out of the tunnel, a pick in each of its hands as it gores Crannoc.

Attack: 28 Damage: 46

If the attack hits, Crannoc must make a Strength saving throw.

Initiative:

Crannoc - 10

Maggwyn - 16

Jasper - 24

Miesha - 16

Minotaur - 6

Order: Crannoc, Maggwyn, Miesha, Jasper, Minotaur

Crannoc - The DC of the Strength saving throw is 14, and if you fail you are knocked prone.

Crannoc STR Save:  14 exactly.

The cleric of Temuth gasps as the bull creature gores him, his hand flashing out at first to create an arcane Shield before sensing instinctively that it would not be enough to counter the ferocity of the enemy's blow.  He staggers and stumbles, but somehow maintains his feet.

Bonus Action:  Crannoc summons his spectral pine needle Spiritual Weapon and attacks once more (final second level slot).
To hit:  27
Damage:  10 (force)

Action:  As he throws out his arm to steady himself, spiky vines shoot forth at the bull-like creature (Thorn Whip cantrip).
To hit:  21
Damage:  5 (magical piercing)

Part of Crannoc wishes to retreat, but he merely re-positions to give his companions room to attack and possibly flank.