Troubling Dark Magics, Goblins, and Miasma

[In Daria's Book]
 
To Saia Daria, I send greetings and a question,
 
My sister, we have encountered a strange set of events that I ask your guidance on. As you may know, an earthquake hit Swannport and the surrounding area. We have been asked to investigate this. In our short days of travels we've come upon a tragic sight. A rift in the earth seems to be in the epicenter of the quake. Indeed at the bottom of it, a man lies sacrificed. The decay seems to match the timing of the quake. His heart was removed from his chest. All around are various paraphernalia and symbology. In fact, what could be a summoning circle as I've heard of them or perhaps even something else. Regardless I will describe on the next page everything I've seen, the placement, and the particulars of the symbols used.
 
It should be noted the miasma seeped from the in the rift. We avoided it, thank the Three.
 
The man was a local Minari native. He and his family were taken by goblins who no doubt delivered the man to whomever did this. Jak, our collector, skillfully deceived the goblins holding the rest of the family. They are safe, alongside the young daughter whom we found fleeing though the woods some days earlier. We encountered several powerful wolves under the goblin's control, and while defeating them, we intend to go back to capture and question one of the goblins. For now we rest.
 
<Seraphina Describes all the remains from the rift>
 
We don't know what we are up against, but we theorize the goblins do - at least after a fashion. Any help you might give on the type of magics that would cause such a disturbance and would require sacrifice of such barbarity.
 
Your gracious sister,
 
Brännkvinna