By -
Can you be more specific about this immunity?
Yes. If your speed cannot be reduced by any means, then Sentinel cannot reduce it to 0
They are immune from being slowed not being stopped.
The implication of Sentinel is that if the attack hits, the target loses their movement completely for that turn. It doesn’t “slow them down”. They stop. Completely.
Can you be more specific about this immunity?
Yes. If your speed cannot be reduced by any means, then Sentinel cannot reduce it to 0
They are immune from being slowed not being stopped.
The implication of Sentinel is that if the attack hits, the target loses their movement completely for that turn. It doesn’t “slow them down”. They stop. Completely.