Came across this old spell while doing research for the second edition dimensional warper monster. To really get the feel for these old school, reality-bending snake men, I thought it might make sense to convert duo-dimension to a 5th level spell.
The following is a new sorcerer or wizard spell.
Casting Time: 1 action
Components: V, S, M (an ivory figurine carved to look like the caster with a total value of at least 500gp and a strip of parchment paper, both of which the spell consumes)
Duration: Concentration, up to 1 minute
Your form collapses in on itself, leaving you with only two dimensions: height and width, with no depth. As a duo-dimensional wizard, you can pass through the thinnest of spaces as long as the space has the proper height. For example, you can squeeze through the space between a door and its frame without any trouble. While two-dimensional, you perform actions normally. As a bonus action, you can turn sideways to disappear, detectable only with a true seeing spell or similar method. While invisible, you can not be affected by any form of attack nor can you make attacks, interact with objects, or cast spells. However, when you are visible, you are subject to double the normal amount of damage from attacks as if hit by a critical hit.
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