Would a PC with the Sentinel feat have an opportunity attack against a Bulette which is trying to burrow? If so, would it able to burrow with 0 movement speed (In place in the same square)? Does size make any difference in stopping such a large creature?
[RPG] sentinel vs burrowing and large creatures
dnd-5efeatsopportunity-attack
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Best Answer
I would say yes, given the following in PHB 195:
So, if you can see it trying to burrow and it's within your reach, you hit as it tries to leave, and then it can't move any further.
And no, size makes no difference to Sentinel (features/spells/feats that take size into account mention it explicitly. I.e., Ensnaring Strike agrees with your intuition—it's a spell that attempts to hinder a creature, and anything Large or larger has advantage on the saving throw. As you can see, however, Sentinel doesn't have a similar caveat.)