It comes up more often than you'd think
You could always just use the rules for diagonals on page 252 of the DMG
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What are your thoughts about Video Game to Boardgame adaptations?
I think that's plausible, but the boardgame and the video game are very different. If the video game is descended from the board game the change of medium made some big changes. The board game has a big emphasis on trading that the video game cannot reproduce. And the board game doesn't have individual city management.
I haven't been on there in a long time but the link below has a way to play it online. http://civ.rol-play.com
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Characters I've been banned from playing [OC]
And if you take 3 levels of armorer you can have your armor change to fit your new form to have a good AC and shoot lightning as you slither around as a robosnake
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