It could be any type (chest,legs,arms, or head.) but I think it would best fit the chest or head. Anyway, the exotic perk causes nova bomb to create a black hole on impact, sucking in nearby enemies and lasting for a couple seconds. This would go great with the vortex passive affect that attunement of hunger has, which causes the nova bomb to leave a damage dealing aoe field on impact.. Any nearby enemy that is close to the nova bomb but isn't affected by the AOE field would be sucked in and therefore damaged by the vortex. I think this would be a great exotic that really helps out warlock players while being fairly balanced.