An extremely rare non-dangerous monster, prized for its highly sexual needs for feeding, it's a medium lizard-like monster with four tentacles instead of a tail, these tentacles are used to bind prey for breeding and feeding purposes, it has been reported impossible to kill them through non-magical means.
An average Sariance's stats:
HP: 10d8 + 23 (83)
STR: 40 (+15)
DEX: 26 (+8)
CON: 16 (+3)
INT: 10 (+0)
WIS: 12 (+1)
CHA: 18 (+4)
AC: 22 (30)
The only known weakness of a Sariance is mental magic, it is immune to any and all physical damage and has resistance to all elemental damages, appearing to be a form of divine creature with unknown purpose, they do not attack people with intent to harm however will rape people when hungry, known to never cause serious or any physical harm at all.
There is no known reason for anything about them, there is little to nothing known about them as well.
It is known that at least 27 of them exist in the echelons of nobility and are often treated as sexual toys, it is unknown how many exist outside captivity but they are spotted outside captivity rarely.