Wall of Fire
An Ordinary Aura and blazing barricade
Conjure atop the border of a site you control. Whenever a unit passes through Wall of Fire, it takes 3 damage.
Matt Tames

FAQs
Q: How many squares does this aura occupy?
2
Q: What does “passes through” mean?
Moving through in any way, whether willingly or by force. For example, a unit moved by Grapple Shot or Pudge Butcher would take damage from the Wall of Fire. Note that a teleported unit doesn’t pass through borders, and thus wouldn't be affected.
Q: Does this affect Airborne units?
Yes. (They are atop the site.)
Q: Does this affect subsurface units?
No. (They are not atop the site.)
Q: Does this affect the corners of the border? (e.g. Airborne units moving diagonally)
No. "Border" means adjacent squares, not including diagonals.
Q: What if this is animated by an Enchantress?
It can move, but units are not passing through the Wall of Flame due to its own movement. After moving, its effect will apply between the two squares it occupies.
FAQs
Q: How many squares does this aura occupy?
2
Q: What does “passes through” mean?
Moving through in any way, whether willingly or by force. For example, a unit moved by Grapple Shot or Pudge Butcher would take damage from the Wall of Fire. Note that a teleported unit doesn’t pass through borders, and thus wouldn't be affected.
Q: Does this affect Airborne units?
Yes. (They are atop the site.)
Q: Does this affect subsurface units?
No. (They are not atop the site.)
Q: Does this affect the corners of the border? (e.g. Airborne units moving diagonally)
No. "Border" means adjacent squares, not including diagonals.
Q: What if this is animated by an Enchantress?
It can move, but units are not passing through the Wall of Flame due to its own movement. After moving, its effect will apply between the two squares it occupies.