The compendium item Sword of LifeStealing (<a href="https://roll20.net/compendium/dnd5e/Sword%20of%20Life%20Stealing#content" rel="nofollow">https://roll20.net/compendium/dnd5e/Sword%20of%20Life%20Stealing#content</a>) says when you roll a 20 on a hit with the weapon it deals 3d6 extra necrotic damage - this is not accurate. The DMG and the SRD were updated to show this as a flat 10 necrotic damage a long time ago. The D&D beyond entry is here: <a href="https://www.dndbeyond.com/magic-items/sword-of-life-stealing" rel="nofollow">https://www.dndbeyond.com/magic-items/sword-of-life-stealing</a>