From the school of Transmutation, Alter Self is a 2nd level spell available to sorcerers, wizards, and artificers. If you’re a circle of the moon druid you’ll get this at will at level 14. 

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Players help the undead clothier Michael Korpse gather rare spider silk to continue his zombie-friendly clothing line. They encounter dangers, including the spiders themselves as well as a disgruntled wight in this cave encounter for levels 4-7.