Source: Candlekeep Mysteries
Scroll, legendary
Unlike most scrolls, a Nether Scroll of Azumar is not a consumable magic item. It takes 30 days of concentrated study—at least 8 hours per day—to attempt to understand this scroll. After completing this study, you must make a DC 25 Intelligence (Arcana) check. If this check fails, you take 16d10 psychic damage, and you can attempt the check again after another 30 days of concentrated study.
When you succeed on the check, you gain the following benefits:
When you gain the scroll's benefits, a stone golem magically appears in an unoccupied space within 60 feet of you and acts as your ally. If you die, the golem turns to dust.