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Assume I am playing a druid or warlock with the War Caster feat, which allows me to cast single target spells in place of using a melee attack of opportunity. I also know the thorn whip cantrip. A successful hit with thorn whip can allow me to pull the target 10 feet. I am facing an opponent with the dimension door spell and want to stop them from getting away.

If the enemy spellcaster were leaping or stepping midway through the dimension door, would it be possible to cast thorn whip using the War Caster feat, hit the target and pull them out, thus preventing them from moving with dimension door?

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    \$\begingroup\$ Welcome to rpg.se! Take the tour and see this meta for other places you can find help. Or just ask here in the comments (use @ to ping someone). Before we can answer this question we need to know what system and edition you are playing. The best way to show this is by editing in the correct system tag (e.g. dnd-5e) until then your question may be closed. Good luck and happy gaming! \$\endgroup\$ – linksassin Jun 27 at 5:57
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The hostile creature’s movement doesn't provoke an opportunity attack from you, so your War Caster feat isn't triggered.

The War Caster feat (PHB 170) says:

When a hostile creature’s movement provokes an opportunity attack from you, you can use your reaction to cast a spell at the creature, rather than making an opportunity attack. The spell must have a casting time of 1 action and must target only that creature.

The hostile creature’s movement doesn't provoke an opportunity attack from you, so your War Caster feat isn't triggered.

The Dimension Door spell description (PHB 233) says:

You teleport yourself from your current location to any other spot within range. You arrive at exactly the spot desired. It can be a place you can see, one you can visualize, or one you can describe by stating distance and direction, such as "200 feet straight downward" or "upward to the northwest at a 45- degree angle, 300 feet."

Dimension Door is a teleportation spell, and teleportation doesn't trigger opportunity attacks.

The rules on opportunity attacks (PHB 195) state:

You also don't provoke an opportunity attack when you teleport or when someone or something moves you without using your movement, action, or reaction.

Additionally, spells do what they say they do, and the spell description of Dimension Door does not say it creates a door that you need to pass through; it merely teleports you to the spot within range, so the proposed mechanism to prevent the teleportation from occurring wouldn't work, either.


Thank you to nick012000 for contributing the additional note.

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    \$\begingroup\$ So the best bet would be to use a counter spell, gotcha. \$\endgroup\$ – user56399 Jun 27 at 6:17

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