Dinosaur, Therizinosaurus 2014
CR 5 beast
Huge beast, unaligned
STR21 (+5)
DEX9 (-1)
CON17 (+3)
INT3 (-4)
WIS14 (+2)
CHA7 (-2)
Relentless (Recharge: Short/Long Rest).
If therizinosaurus would take 20 or less damage that would reduce it to less than 1 hp it is reduced to 1 hp instead.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details