002 - Devoid (Diu and Alio)

In my story, there are beings that seemingly act as "attack dogs" for the main antagonist group, used to attack and drain the energy of their enemies. These beings are called the Devoid. They appear in the human world in a total of four main stages or forms, each varying in appearance and capabilities. As a species, the Devoid are alien to the human world and only truly exist completely within an entirely different realm.

The first stage, called Devoid Diu, can be considered a shadow of what the Devoid truly look like. This rough sketch/design piece illustrates the hollow nature of their appearance.

As a Devoid grows in strength, experience, and energy consumption, it can develop into the next stage. Each stage allows for a Devoid to slowly regain that which it doesn't normally physically have while existing in the human world. In other words, a Devoid at a higher stage will become more powerful and appear more complete.

I don't have a current scan of the second stage, but I do have this rough design of the third stage, called Devoid Alio. Although noticeably different in appearance from the Devoid Diu, the Devoid Alio is far closer in appearance to the final, true form of the species.

Which of these two seem scarier? Diu, with its long bony arms and reptilian jaws instead of an abdomen? Alio, with its stretched flesh and limbs, appearing to be scheming? Or perhaps both are disturbing in their own ways?