Rakshasa, Slayer 2014
CR 9 fiend
Medium fiend, lawful evil
Can’t be affected or detected by spells of 4th level or lower unless it wishes to be. Has advantage on saves vs. all other spells and magical effects.
Bonus Actions
Takes the Dash Disengage or Hide action.
The slayer studies one creature it can see within 30' of it granting the slayer advantage on the next attack roll it makes vs. the target before start of the slayer's next turn. If the attack hits slayer's weapon attack deals extra 9 (2d8) piercing damage.
Reactions
When a creature moves into a space within 5 ft. of slayer while slayer is in dim light or darkness slayer can teleport to unoccupied space it can see within 30' of it. Destination must also be in dim light or darkness.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details