Nightstalker

Rank	Effect	Flavor
1	+50 Stealth, -1 LOS	You are slightly more attuned to the shadows.
2	+100 Stealth, -2 LOS	You are significantly more attuned to the shadows.
3	+150 Stealth, -3 LOS	You are completely attuned to the shadows.
Good mutation, Demonspawn mutation
Prior to 0.16, this mutation only gave 40 stealth per rank.