The Grand Dad is a Post-Moon Lord broadsword that drops from the Moon Lord. It is the rare variant of the Grand Guardian. Whenever the Grand Dad contacts a non-boss enemy, their defense is reduced to zero and their knockback resistance is set to -600%. It also has an exceptionally high knockback stat and size.
Its best modifier is Legendary.
- The Grand Dad's knockback resistance removal can affect enemies that are immune to knockback.
- The defense and knockback resistance removal does not affect enemies with no contact damage or most event minibosses.
- The knockback makes this weapon a good tool to keep an enemy with high health away.
- Its name and tooltip, as well as the "7" on its sprite (and the 777 base damage and 77 knockback), are a reference to a meme known as "7 GRAND DAD," a Chinese bootleg copy of The Flintstones: The Rescue of Dino & Hoppy for the Famicom system and popularized by Vargskelethor a.k.a Joel from Vinesauce, and SiIvagunner.
- The word "Yeet", which is present in the tooltip, is internet slang that means "to throw at high velocity".