Dokucu, the Ominous

Dokucu, more commonly referred to as The Ominous is a spirit that feeds on suffering. It is unclear if the Ominous is a planeswalker, but it is able to travel between planes in some way. The Ominous attached itself to Aiden of Sunspear, and became focused on causing Aiden as much suffering as possible, even past his death.

After Aiden's death his soul joined his wife's and daughter's in the Sunspear, which was carried by his adoptive daughter Karina Oblay, causing her to became a target of the Ominous as a result.

While the Ominous has not made much visible appearances in many years, there are still suspicious events that may be it still subtly leaving its mark on its targets.