Nihilist

When a research team unlocked the secret to multiverse travel they explored many strange new worlds.

One world designated NS-482 was a barren ash covered plant. Researchers concluded that life had once existed there, but due to some cataclysmic event had all life on the planet had ceased.

Researchers found a single skull and despite being ordered to leave it there the search party returned with it.

Some members of the scientific institute became emotional and pessimistic; seemingly happy healthy individuals began violent outburst and reported feeling exhausted.

Researchers soon discovered the skull they had returned with appeared to be radiating strange energy readings. The next day members of the research party were found seemingly having hung themselves within the lab. The Skull was declared missing.

The Nihilist is an extremely powerful Psychic vampire, it's only physical remains are its skull. The swirling cloud of Psychic energy builds as the Nihilist feeds on living minds.

It's motives are simple:

1. consume all of the psychic energy of a world

2. turn the population into it's subjects

3. destroy all life

4. Lie dormant until discovered by a new species.

Because of it's vast psychic powers the Nihilist can turn entire populations against one another, causing riots and acts of violence that appear to have no logical reason.