For Prime Runners, metasapients from Run Faster are allowed as conversions from the previous campaign.
The Pixie. Like previous editions, it is listed as having the Vanishing weakness. In previous editions, this was described as, "they disappear when they die". Poof. Gone. No possibility of resuscitation.
Also like previous editions, there is confusingly a separate Vanishing critter power that is decidedly not the same. This version of Vanishing is more or less a Teleport At Will ability, and cannot be stopped by any known means. It appears in Aetherology, and operates the same as previous editions.
However, unlike previous editions, there is no writeup at all for the pixie Vanishing weakness.
No descriptive text at all.
Just a one-word entry in the stat chart.
Unless you knew the previous edition's rules, there is no way to know that the Vanishing weakness is NOT the same as the Vanishing critter power. I cannot imagine the intent was to give the Pixie the teleport-at-will version. That just breaks pretty much the whole game.
So... wait for Errata?
-k