Moonrithyll's Knight Sword can be obtained by defeating Moonrithyll, Carian Knight, an NPC phantom found in Castle Ensis. Check out the map below for the exact location.

The Cleanrot Knight’s Sword is a Thrusting Sword in Elden Ring that scales with Strength and Dexterity. The weapon comes equipped by default with the Impaling Thrust Skill. The Cleanrot Knight ...