Editing Stars Without Number: Back in Black (section)

=== Characters & Character Generation ===
*After first level, characters gain double hit points.  
*New PCs start out one level below the lowest-level PC who has gained at least one level in the course of play.
*Hit Points: I reroll a character's entire pool of hit points each time they level.  You take the new result if it is higher.  If the new result is equal or lower to your current result, you instead gain one hit point.
*A character may reroll their entire pool of hit dice by spending one week on vacation, doing nothing of note (including travel!)  In this case, the new result must be taken even if it is worse.