Right, I know says this is 155 words, but I assure you; the drabble itself is 112.
Morsmordre
"Mors – morsmordre!" Bellatrix hissed. Nothing happened. Again. She gritted her teeth. Her master smiled at her frustration. "Patience, dear Bellatrix."
"Are you sure you should be wasting your time on this, My Lord? I'm sure you have better things to do."
"I have other things to do. Not better ones. You are my Bellatrix; the fire to my ice. The Cause needs us both."
The Dark Lord took her hand. Bellatrix caught her breath.
Voice clear as crystal, he murmured into her ear. "Morsmordre is the spell. Morsmordre." Bella nodded. "The Cause needs us both" ringing in her ears, she shouted "Morsmordre!"
A smoky green Mark hung in the air above them.