The stats for a Thalassic Behemoth include the word "unstoppable" in its Defenses section.
So far as I can tell, "unstoppable" is not defined anywhere in Bestiary 3. The only ability I've been able to find by that name is the 8th-tier mythic ability. But it can't be that, because 1) generic Behemoths have no mythic power, and 2) Bestiary 3 was published 2 years before Mythic Adventures came out.
So ... what does "unstoppable" mean in this stat block?
It's under the Behemoth subtype in the appendicies:
Unstoppable (Ex) If a behemoth starts its turn suffering from any or all of the following conditions, it recovers from them at the end of its turn: blind, confused, dazed, deafened, dazzled, exhausted, fatigued, nauseated, sickened, slowed, staggered, and stunned.
|John Compton Pathfinder Society Lead Developer|