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The spell cannot create 5x5 panels

Which means the math in the question is moot.

The spell states, it creates "ten 10-foot-by-10-foot panels." at 6 inches thick. Or, "10-foot-by-20-foot panels that are only 3 inches thick."

The closest a character could do is create a box that has two panels on each side (qty 8) and two more on top to use up the 10 panels. This would give them a foot of wall on each side.

So the math would be...

12" thick sides x 30hp = 360 hp per side

4 walls + 1 roof = 5 surfaces x 360 hp = 1800 hp total for the structure

The spell cannot create 5x5 panels

Which means the math in the question is moot.

The spell states, you createit creates "ten 10-foot-by-10-foot panels." at 6 inches thick. Or, "10-foot-by-20-foot panels that are only 3 inches thick."

The closest a character could do create a box that has two panels on each side (qty 8) and two more on top to use up the 10 panels. This would give youthem a foot of wall on each side.

So the math would be...

12" thick sides x 30hp = 360 hp per side

4 walls + 1 roof = 5 surfaces x 360 hp = 1800 hp total for the structure

Your math is not the question, it's your logicThe spell cannot create 5x5 panels

Which means the math in the question is moot.

The spell states, you create "ten 10-foot-by-10-foot panels." at 6 inches thick. Or, "10-foot-by-20-foot panels that are only 3 inches thick."

You cannot create 5x5 panels.

So youThe closest a character could do create a box that has two panels on each side (qty 8) and two more on top to use up the 10 panels. This would give you a foot of wall on each side.

So the math would be...

12" thick sides x 30hp = 360 hp per side

4 walls + 1 roof = 5 surfaces x 360 hp = 1800 hp total for the structure