Wall of Iron Spell
D&D Description of the Wall of Iron Spell : You cause a flat, vertical iron wall to spring into being. The wall inserts itself into any surrounding nonliving material if its area is sufficient to do so. The wall cannot be conjured so that it occupies the same space as a creature or another object. It must always be a flat plane, though you can shape its edges to fit the available space.
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Note: Add a Reply about how you have applied the use of the Wall of Iron spell in a previous Dungeons & Dragons scenario.