Invalesco is a Vamp who serves as a second in command in the Blood Drinkers gang, led by Malphas.
During Malpha's and his Lupines counterpart's (Ookami) planned insurrection over The Merovingian, who was controlling the two exile gangs. Invalesco attempted an underhanded power grab whilst Malphas was pretending to be kidnapped.
He also offered the humans that joined him into immortal vampires like himself with his source code. Unfortunately for him, Malphas hunted him down and killed him upon his return by stabbing him in the heart with a wooden stake.
He was the brother to Feronus.