(Spells, bois!)

Eraqrin uses a slot of his Divine Sense to detect any good or evil presence in the cave.

A strong sense of evil emanates from the direction of the groans. Eraquin's spell echos back to him.

Eraqrin pulls out a torch and lights it with his tinderbox, then tosses the lit torch into the tunnel that the groans are coming from.

Strength roll: 8

Eraqrin also searches the ground to see if the small displacer beast dropped any magic items.

3

The displacer beast carcass remains at Eraqrin's feet. You wonder if you can use the pelt as clothing and the head as a trophy of sorts. 

With the torch hitting the ground, you see at the distance the mangled remains of the larger displacer beast, the two goblins, and the hobgoblin, all clumped up together in one mass, as if phased together. The hobgoblin's head still conscious, but barely alive. "Pay...~" It tried to speak with its labored breath, "You will all pay~!"

Grotesque as it is, it has also phased within the rockface. You are wondering how it can still be alive. 

Eraqrin looks at the mass of flesh inhabiting the tunnel and shakes his head, before skinning the carcass of the juvenile displacer beast and turning it into a fine cloak. "Hey, can anyone tell me if the cloak I just took from this thing is magic? It feels tingly, but I don't know if that's something bad or not."

T'ohra walks up to the still living hobgoblin, shaking her head at the state of it. "I care not for you claims of vengeance, but I will grant you the mercy of the after. Nothing deserves such a wretched fate." With that, she raises her warhammer calling on her divine power and casts sacred flame on them, bringing the hammer down at the same time to smash its skull.

(I think you either try to attune with it to see if its magical, or find someone to identify if it is...)

With the powerful strike, T'ohra shattered both the stone and the wall which was covering the cave mouth. The collapsed rock exposed the forest beyond and an unfamiliar wind.

Looking at the twisted remains, and the shattered stone, then out at the forest, T'ohra blinks, then looks at her hammer. "I... did not expect that."

Saproth walked passed T'ohra and Eraqrin as he admired the pelt he had just skinned. "Morbid," He shook his head in disapproval.

As he smelled the air, he notes, "Where are we? Where are the pine trees of the forest from before? This is not where we were..." He looked back to the others, "Bananas?"

Eraqrin give Saproth a quizzical look, before casting Detect Magic on his new cloak to see if it's magical.

"Banana's?" T'ohra says slowly, arching a scaled brow at Saproth, stepping out passed the wall to see if there were any, or if the recent turn of events had addled him.

Eraqrin only felt a hint of wild unrefined magic eliminating from the makeshift cloak. Perhaps if it was made by someone with better mastery, you think to yourself.

As if in que, the sun rises from the far mountains, casting light at the entire plain. It was definitely not where they were before as the surroundings were filled by tropical plants.

Saproth walked two steps outside the cave opening to see the cave in its entirety. It was as if a gigantic rams horn made of metal have been jammed into the foot side of this hill. "Well, I guess I know that wasn't just a dream, now..." He sighed as he put together what might have happened. "Did anyone else have the same dream?" he asked.

Ellren chimes in, "I wonder if those darts did something to us."

(do you have a character while being DM?)

then i cast produce flame to create fire in my hands, keeping it at the ready.

Hreddun finds himself in a cave. He produced flames to give him a better look of his standing.

At the other side of the cave, everyone was starting gather and collect their thoughts, Ellren chimes with, "I wonder if those darts did something to us."

Saproth noticed lights flicker from inside the cave and says, "Hey, look..." he called the others attention to the curious lights. 

Someone then stepped out towards them. They all started to gaze at each other inquisitively. "I realize our previous introductions have been interrupted by that goblin before all this happened, and I know he aint a beast or goblin, but I dont think he was with us before..." Saproth said with hesitation and concerned alert.

In the cave, Hreddun finds only scattered evidence of a battle, goblin bits, a skinned up juvenile displacer beast carcass, pieces of wooden sticks,  tranquilizer darts littered around, and what looks like dwarven writtings on the walls.

I'd like to cast comprehend languages and read the Dwarven writings on the wall.

Or ask Bramnus what it says, actually.