Ichor of Thrael

And wenn this philtre hath brewed,

Steeped it should be beneathe the new Moon,

Infused with the Darke Lyght,

So the will of thy slave 

Be totally consumed.

The Ichor of Thrael is an age-old tool of witches and slavers.  A closely-guarded secret, its ingredients are rumored to include the blood of a vampire's enslaved minions, the fruit of the moonflower, and water from the deepest and coldest wells.  The brew is then left under the light of the new moon and enchanted with various incantations.

When fed to a victim, the Ichor strips him of all free will and ambition and places him in the power and service of the brewer (save vs. spells to avoid).  Those under the enchantment of the philter essentially become mindless automatons, pawns in the service of another.  They may fight, speak (albeit slowly and sometime with difficulty), and complete relatively basic tasks but they lack any desire or ability to act on behalf of themselves.  When under the influence of the Ichor, victims are obviously "not themselves."  Their eyes have a vacant, glassy stare, their voices are monotone, and their actions--while functional--are without grace or style.

The effects of the Ichor last 24 hours per dose (about half a cup of liquid).  As the dose wears off, the victim first becomes ravenously hungry and may act like a panicked animal as their instincts return.  After an hour or so of panic and hunger, they fall into a deep, coma-like sleep for at least eight hours.  Once awakened, victims remember nothing of their actions or encounters while under the potion's hold.