It could easily be a wraith. The growling isn't coming from a beast -- more like a rage driven, bestial, howl.
Moments later, the group can hear the drone of a hornet swarm, and a wave of a sickly sweet stench of decay pours through the doorway.
A cloud of four glowing red eyes, surrounded by a swarming mass of ghostly hornets steps into the doorway. Wrapped in a wispy, tattered cloak, it's ethereal form floats a few feet above the ground. Although it has no discernible face, it appears to almost stare at the floor where Rachael's ashen form fell. It lingers there only briefly until it turns its ghastly head toward Sour Heck.
Iesha 1d20 + 1 ⇒ (16) + 1 = 17
Peredur 1d20 + 5 ⇒ (13) + 5 = 18
Sour Heck 1d20 + 6 ⇒ (1) + 6 = 7
Talia 1d20 + 2 ⇒ (18) + 2 = 20
Eloise 1d20 + 5 ⇒ (8) + 5 = 13
Brother Swarm 1d20 + 5 ⇒ (4) + 5 = 9
Thing in doorway
All PC's may act
The party may act with a standard or move action in a surprise round as the creature is apparently distracted at the spot on the ground and everyone was ready for action. You may also go again with your normal action in initiative order.