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Message: <blockquote data-quote="Oofta" data-source="post: 9188514" data-attributes="member: 6801845">There are occasionally be things I know as a DM the players don't. But there are others when it's just a judgment call.I don't know the CR details but I probably wouldn't allow sentinel to work on a tarrasque as an example. It's a scaled up 50 foot tall t-rex.  It could see it working on even a huge giant because I could see an attack to the creature's Achilles tendon or the back of the knee causing it to stumble. But yes, there are limits to what I would allow no matter what feature is in play. It's going to be exceedingly rare though, on the verge of being hypothetical.</blockquote>