You are the Harbinger of my Love (incomplete)

Harbinger floated above the nexus in London's dying heart.
Shepard coughed: blood splurted from his lips, and he felt his body shaking. No... no... so close... they couldn't fail now... he couldn't... he lost his footing and fell to his knees. His shattered armor buckled under the stress, his only gun helplessly melted into worthless scraps.
A Marauder stepped around from behind cover, and Shepard desperately tried to raise the energy for so much as a simple throw... but the Marauder stopped, lowered its gun. As if...
"Shepard..."
It wasn't a voice, it wasn't words, it wasn't in the air, it was everywhere, as if the whole world pulsed at once to give voice to first Reaper. It shook Shepard to his very core. Now, here, the unbeatable warrior who could never give up understood why mortals were filled with dread at the sound of the Reaper's voice... but still Shepard would not give up.
He looked up. Harbinger still floated there, its whole attention turned towards the ground, towards him. It would take no more effort to finish Shepard off than it would take for the human to crush an already dying ant, and yet Harbinger did nothing.
"... you have become..."
A skyscraper-sized tentacle stretched towards the wounded Commander. Tiny fingerlings extended out from it, fractal reflections of their massive mother, until finally only a single tip reached towards the dying human. Shepard glared at it. He would never give up. Never...
And with all the tenderness of a child lifting a butterfly from the ground, the single tip lifted Shepard's chin up, as if contemplating Shepard's resolve.
"... an obsession."