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Message: <blockquote data-quote="doctorhook" data-source="post: 5222104" data-attributes="member: 58401">Size categories are problematic, even at Medium; they become much more problematic as you look at larger categories.Human adults are said to take up a 5'x5'x5' cube in D&D. Most humans are always "sticking out" the top of that cube, but are never affected by what happens in the cube their head is in; however, probably no humans are actually five feet across -- the extra space is implied to be the area around a person in which they move. Reach (melee 1) makes this even more complicated, because now our too-tall-too-skinny human can punch someone five feet away, anywhere within another 5'x5'x5' cube adjacent to the first one. Our humans are too tall, too skinny, and can reach too far.A Gargantuan creature has the same problems, only much worse. If it's a "tall" creature (taller than it is wide), it's probably as much as twice as tall as it is wide, which means that a "20'x20'x20'" creature might actually supposed to be 40' (or more) tall... despite the fact that it doesn't technically occupy any of space above 20'.Size categories are an abstraction. I recommend not thinking about it so much.(PS: There comes a point when a sufficiently large monster should be treated as terrain. Think of the Tarrasque as a moving cliff that your players need to climb and hang on to during combat. Except that they'll be trying to kill this cliff.)</blockquote>