squaky pmed me, saying that the negar are too strong. Looking at it, he is totally right. Given their power, i suspect that given a hundred years they would snowball and kill all sentient life on the planet.
So, some changes.
First: the negar's strength is directly related to the phase of the moon. The closer it is to the full moon, the weaker negar are, on the full moon they cannot materialize. This effects their regeneration (none within 6 days before or after the full moon), strength (extremely weak close to the full moon), magic (almost none near the full moon) and the intelligence of the natural negar (close to the full moon they are basically suicidal lemmings and are unable to do things live avoid obvious traps or open doors), and difficulty to kill (within a few days of the full moon they will pop like soap bubbles, within a few days of the dark of the moon their hide is extremly tough). Negar are only at maximum strength and power within 2 days of the dark of the moon (so 5/28 days they are same strength, 13/28 they are basically jokes to fight, and 10/28 days they are fairly dangerous). Natural negar also have a lifespan of only 5 years, and new ones spawn 5 years after they die.
This means that the created negar (eg. dark elf negar and such), will stay inside the city (where it is always dark) when it is close to the full moon to stop from dying pointlessly. In addition, since most people the negar killed weren't warriors, they won't fight as a negar either, and will just peacefully live in the city.
In addition i change the negar from being etheral during the day, to living in a alternate plane (so that they phase shift at sunrise and sunset). The plane is the same as ours with the following exceptions: buildings in the real world still exist, and are impossible to damage or pass through or over (so you could build a fence and the negar couldn't get to the other side during the day). Oceans don't exist (eg. one step will take you from one continent to another). And the negar are slightly stronger then in the regular world (and have strength inverse to the current cycle of the moon in the real world, so a negar would be super strong on the full moon, but weak when their is no moon).