Stellar Knife - Official Calamity Mod Wiki

The Stellar Knife is a Hardmode dagger dropped by Aries after Astrum Aureus is defeated. When thrown, it moves and rapidly spins in the direction it was initially thrown, slowly decelerating and losing spin speed over time. Once the knife fully decelerates, it then remains still until an enemy is within its detection range for it to home in.

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Stellar Knife! Calamity Rogue Class Let's Play, Episode #14

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Igneous Exaltation - Calamity Mod Wiki

So, I made some scythe sprites : r/Terraria