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<blockquote data-quote="Pauper" data-source="post: 7289193" data-attributes="member: 17607">Realized on reviewing the rules for reactions that there is a better interpretation -- the DMG contains a rule (referenced in the Sage Advice Compendium) that, if a reaction does not have a specific timing noted, the presumption is that the reaction takes place after the event that triggered it. It's a complicated chain of events here, but the key is not the reaction used for the opportunity attack (which by rule occurs just before the creature leaves the attacker's reach, BR, p.73) but the one for the creature's movement. The Wall of Stone spell does not specify when the reaction for movement takes place, so by the rule in the DMG it happens after the event that triggered it. A DM could rule that this is the casting of the spell, which can result in the following chain of events:cast Wall of Stone -&gt; saving throw -&gt; successful saving throw allows movement -&gt; move triggers opportunity attack -&gt; wall formsHowever, a DM could also rule that the triggering event is the formation of the wall, since the creature doesn't get a saving throw if the wall wouldn't cause it to be &quot;surrounded&quot;, resulting in the following chain of events:cast Wall of Stone -&gt; wall forms -&gt; wall would surround creature -&gt; creature gets saving throw -&gt; successful save allows movement -&gt; movement triggers opportunity attackIf the creature and the caster begin adjacent to the wall, the creature would be fully &quot;in the wall&quot; before it leaves the caster's reach (this is true regardless of the size of the creature -- use a grid and miniatures to demonstrate this for yourself if you like), and a creature inside of a wall would arguably have total cover from the caster and thus not be eligible to be attacked (&quot;A target with total cover can't be targeted directly by an attack or spell...&quot; (BR, p.74)).Since the caster does not have to shape the wall in such a way as to allow the enemy an adjacent wall square in which to 'escape', I've left the answer to the question the same, but it would be a lot simpler to simply declare that the reaction that allows the creature to move occurs before the wall actually forms, eliminating this weird corner-case.--Pauper</blockquote>

[QUOTE="Pauper, post: 7289193, member: 17607"] Realized on reviewing the rules for reactions that there is a better interpretation -- the DMG contains a rule (referenced in the Sage Advice Compendium) that, if a reaction does not have a specific timing noted, the presumption is that the reaction takes place after the event that triggered it. It's a complicated chain of events here, but the key is not the reaction used for the opportunity attack (which by rule occurs just before the creature leaves the attacker's reach, BR, p.73) but the one for the creature's movement. The Wall of Stone spell does not specify when the reaction for movement takes place, so by the rule in the DMG it happens after the event that triggered it. A DM could rule that this is the casting of the spell, which can result in the following chain of events: cast Wall of Stone -> saving throw -> successful saving throw allows movement -> move triggers opportunity attack -> wall forms However, a DM could also rule that the triggering event is the formation of the wall, since the creature doesn't get a saving throw if the wall wouldn't cause it to be "surrounded", resulting in the following chain of events: cast Wall of Stone -> wall forms -> wall would surround creature -> creature gets saving throw -> successful save allows movement -> movement triggers opportunity attack If the creature and the caster begin adjacent to the wall, the creature would be fully "in the wall" before it leaves the caster's reach (this is true regardless of the size of the creature -- use a grid and miniatures to demonstrate this for yourself if you like), and a creature inside of a wall would arguably have total cover from the caster and thus not be eligible to be attacked ("A target with total cover can't be targeted directly by an attack or spell..." (BR, p.74)). Since the caster does not have to shape the wall in such a way as to allow the enemy an adjacent wall square in which to 'escape', I've left the answer to the question the same, but it would be a lot simpler to simply declare that the reaction that allows the creature to move occurs before the wall actually forms, eliminating this weird corner-case. -- Pauper [/QUOTE]

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