Next Morning, it was already 9am when Kai went down the stairs with a light dizziness.
The ritual to turn Morrigan into vassal of Death only came to end at stroic and a significant amount of Kai's mental strength was consumed trying to control that vast amount of dark elemental essence after Arya entered Morrigan's body.
In the end the ritual was successfully completed and Morrigan was able to attain the power of fundamental strength of death and darkness.
Only downside was that her water attribute magic origin was completely devoured by the dark magic origin.
According to Arya, it will not cause any problems instead her power will become even stronger and more easier for her to cultivate her unique magic art named Winter of Death.