From Creatures Wikia
The Vampire Grendels are a distinct grendel genetic breed by Grendel Man. The babies, in spite of having an angry look fused onto their faces, are actually quite friendly, their agression being limited to machinery or gadgets. They also eat normally. Adults, however, have a diffrent way of feeding. They attack norns or ettins, and recieve starch and protein from hitting their prey. Also, they become sensitive to light by the time they become adolescent. Light will severely injure or kill adolescent and older vampires. As a result, they have to live in a room without light. Babies and Children can live in light, though. They use the sprites of the Vampyre Grendels and the Dusky Grendels.
They are availible at KnyteTrypper's C3/DS Nexus.