Wondrous Item, Very Rare (Requires Attunement)
Four arachnoid legs that fold into the sides of a girdle, with a pointed spinner in the back.
Silk Spinner. While wearing this harness, you can cast the Web spell (DC 16), requiring no spell slot or spell components. You can use this property twice per long rest.
Wall Crawler. As a bonus action, you can animate the legs of this harness. While they are animated, you gain the following benefits:
You have a climbing speed equal to your walking speed. In addition, you can move up, down, and across vertical surfaces and upside down along ceilings, while leaving your hands and legs free.
Standing from Prone takes only 5 feet of movement.
You have advantage on Acrobatics checks, as well as Strength or Dexterity saving throws to avoid moving against your will.
You are unaffected by Difficult Terrain caused by ropes, vines, or webs, and can walk along them normally.
You can use a bonus action on subsequent turns to cause the legs to disanimate.
When the first strands of webbing fall, it is already too late.