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Feb 28, 2023 at 2:49 comment added Austin Hemmelgarn @Adeptus Four fluid ounces is just a hair over 7.23 in³. If we assume a uniform line width of 0.25 inches with the outer edge being exactly five feet in diameter that gives approximately 47 in² to cover for just the outer circle (not counting any internal designs that would normally be assumed for a magic circle), which those four ounces could cover to a depth of roughly 0.15 in. I have no concrete data, but my gut instinct is that that is probably more than good enough unless the surface is porous or wet.
Feb 27, 2023 at 21:27 history edited Kirt CC BY-SA 4.0
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Feb 27, 2023 at 19:47 history edited Kirt CC BY-SA 4.0
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Feb 27, 2023 at 19:42 history edited Kirt CC BY-SA 4.0
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Feb 27, 2023 at 19:25 comment added Kirt @Adeptus Upon closer reading, you don't actually need that much blood, since making the protective circle is an optional part of the spell: "...you can form a circle on the ground". So you need the full four ounces to make the circle, but you don't have to make the circle to cast the spell.
Feb 27, 2023 at 18:52 vote accept Gilalar
Feb 27, 2023 at 0:29 comment added Adeptus You need enough blood to pour out a circle of about 5' diameter: As part of casting the spell, you can form a circle on the ground with the blood used as a material component. The circle is large enough to encompass your space. I wonder if anyone's done the calculations on required blood per inch to form an unbroken line...
Feb 26, 2023 at 17:24 history edited Kirt CC BY-SA 4.0
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Feb 26, 2023 at 8:30 history edited Kirt CC BY-SA 4.0
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Feb 26, 2023 at 6:53 history answered Kirt CC BY-SA 4.0