Someone tell me how the Blade of Grass is
The Blade of Grass is a weapon with a large reach equivalent to the Fiery Greatsword. It does 28 damage and has a Slow attack speed.
The Blade of Grass is a random drop from the Hornet, found in an underground jungle. It can also be crafted using a Silver Broadsword, 40 Jungle Roses, and 20 Stingers.
Like the Muramasa, the name is likely a reference to a Japanese sword, the Kusanagi-no-Tsurugi (Grass-Cutting Sword). It's the most famous named sword in Japanese historic folklore. However, the name could be a pun on grass itself, as the individual grass strands are called "blades".