Erik Soong's Call of the Netherdeep

Morgan is thoroughly confused, and he can feel his reserves running dangerously low.
But when you hit the bottom… you can still dig.

(Bonus Action: converts 2 Sorcery Points into a 1st-level spell slot.)

He fixes his eyes on the fiend, grimacing.
"Let’s give a shake to that ugly head of yours…"

Morgan casts Mind Sliver on Desu. *(INT Save DC 17 - 9 psychic damage on a failure.)*

Then, unwilling to risk losing concentration on Bless, he retreats farther down the corridor and slips through the first open doorway he can find.

(if permitted under the rules of a free interaction:) As he moves, he lets a healing potion quietly slip from his fingers onto the ground near the west wall, hidden from Desu’s sight.

"Hey, Verin… told you we needed this more than you."
A brief pause.

"Perhaps I was wrong."

DM: Frekor, that is a hit, though it is not enough to destroy the object.

The dagger embeds itself into the chest of the upside down corpse. Desu reels as if struck and almost loses her footing between the tethered pain and the slight swing felt within the room. 

DM: Morgan, Desu barely makes her Save. Happy to let you set down your Healing Potion too.

Morgan can feel Desu throw up mental walls, rebuffing his efforts. Though her eyes are directed toward the center of the room. With the last half a second before Morgan ducks behind the door, he sees that Desu's body language indicates that she plans to make her way toward where her eyes are looking.