Eberron - Scarred Elf Campaign
In most instances, every second square of diagonal movement counts as two squares of movement or distance. For example, if you move one square diagonally it counts as one square of movement, but if you move two squares diagonally it counts as two squares of movement.
This tends to understate diagonal movement by about 6%, but is considerably more accurate than the standard rule, which overstates diagonal movement by 41%.
It appears that the reason for the standard rule is, um, “math is hard”, but since we use a virtual tabletop, which counts movement for us, we avoid that pesky math problem.
Blast areas are an exception to this rule, because they are more complex to calculate than simple linear distance, and as yet I don’t have a good tool for doing so.
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