Rakshasa, Pustakam 2014
CR 5 fiend
Small fiend, lawful evil
STR12 (+1)
DEX15 (+2)
CON16 (+3)
INT13 (+1)
WIS16 (+3)
CHA18 (+4)
False Appearance (Object Form Only).
While it remains motionless it is indistinguishable from an ordinary object.
Limited Magic Immunity.
Can't be affected or detected by spells of 2nd level or lower unless it wishes to be. Has advantage on saves vs. all other spells and magical effects.
Bonus Actions
Change Shape.
Transforms into Tiny object or back into true fiend form. Its stats except size are same in each form. Items worn/carried not transformed. Reverts on death.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details