The Water Sigil is a rather simple sigil. When you press [ПКМ] while looking at a block, you can drain 100LP from your Soul Network to place a source block of water in the world. If there's not enough LP, it will instead drain the toll from your health. Crafted using a Water Reagent and a Blank Slate.
Water Sigil Array
The Water Sigil, next to its crafting array, plus its primary use.
What's more, it can be used in the Alchemy Table to automate the production of Water Buckets. The Sigil is not consumed in this recipe.