The Corrosive Core: 5e Warlock Patron

Your patron is an ancient being who has gained their sentience over time. Their very form has the power to dissolve that which they touch, and all but the most enchanted of metals crumble beneath their might. They are an all-consuming being who lurks in the dark places of the world, an ambush predator that takes every opportunity that presents itself. Examples of potential patrons include the Pudding King, and the Stop.

Your bond with your patron gives you the power to morph yourself as they do, to control their minions, and to go unnoticed until it is time to strike the final blow. You gain the power to serve them and to go where they cannot.

- from the publisher's blurb