As Lucerne followed the boy and Mortis inside the house, the vial came with it's contents sloshing. "Drink a little bit. Not much. Just the same amount as you saw me. You will have to Blink out of here to the roof in order to leave the child behind safely."
Turning the soulmist out into her hand the ghostly woman cupped a small bit of the glittering substance to hold it up to Mortis' lips. Ghosts could absorb soulmist in a myriad number of ways, but to the undead drinking it was just as good as any. Soon at Lucerne's urging, Mortis would stretch a filament of soulmist towards the cupped essence, taking the mixture from lucerne's soulmist which to a mortal would feel likea cold touch on the back of one's neck.
He would look at it, and then her a moment in consternation before imbibing the mixture. Soon all his ghostly strength would be restored, yet the small mixture seemed to sit in his belly suffusing his ethereal mixture with a sense of warmth like after eating some homemade chicken broth soup.
Even if it was still as petching cold to mortals as could be. Due to his possession of the boy, the child collapsed tired to the ground, exhausted and immediately asleep before the ghostly woman tousled his hair with a wave of her hand. Turning back to Mortis, she said. "When you are ready, follow me up there. But close the window first and lock it tight!"
With those words Lucerned carried the vial of soulmist to a window of the house and unlatched it with a ghostly finger before floating upwards out of sight...