Phaseslayer - Official Calamity Mod Wiki

The Phaseslayer is a craftable unique post-Moon Lord melee weapon. When used, a long red laser blade is created that deals continuous contact damage to enemies. The blade always points towards the player's cursor and deals increased damage the faster and farther the blade is swung, encouraging the player to manually swing the blade. Swinging the blade fast enough will cause additional homing sword beams to fire, which deals 15% damage and pierces twice.

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i was in hell exploring and shit cos i was bored and i raided one

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pre-Scal tier weapon tier list (read comments) : r/CalamityMod