Key of the King's Law

The Key of the King's Law is one of the six relics added by Botania. It is obtained from rolling a 2 with a Dice of Fate dropped by the hard mode version of Gaia Guardian. Each player can obtain only one Key of the King's Law. Holding a relic belonging to a different player will deal points of damage every 10 ticks. This item does not despawn when dropped onto the ground.

When the right mouse button is held, it will spawn 20 weapon-shaped projectiles behind the player, using 150 Mana per projectile. Releasing the right mouse button when 20 projectiles are present or selecting a different item will launch the projectiles towards the targeted block, or 64 blocks in the direction the player is looking in if they are not targeting a block.

When a projectile hits an entity or a block, it will explode with strength of 3 (same as a Creeper), but will not damage blocks. A direct hit on an entity will deal an additional points of damage to it. If a launched projectile does not hit anything, it will despawn after 10 seconds after being launched.

Trivia
This item, as well as the projectiles it creates are a reference to Kinoko Nasu's Fate/Stay Night series. More specifically, it is a reference to Gilgamesh's weapon in the novel, addressed by the same name.