Marais Executioner's Sword is a Greatsword in Elden Ring. The Marais Executioner's Sword scales primarily with Strength and Arcane and is a good Weapon for melee users who want to perform a corkscrew attack. 

Elden Ring Marais Executioner's Sword Notes & Tips

• Weapon Skill: Eochaid's Dancing Blade
• This weapon cannot be infused with Ashes of War
• Can't be enchanted with Magic nor boosted with Consumables.
• Marais Executioner's Sword can be upgraded by using Somber Smithing Stones
• As of update 1.03 scaling with this weapon has been fixed
• This weapon has a unique slam R2.
• Sell Value:  

   1000

• Eochaid's Dancing Blade's damage is based on total Attack Rating, so using things that boost your AR will increase its damage significantly.
• Winged Sword Insignia, Rotten Winged Sword Insignia, and Millicent's Prosthesis all boost the damage of this Skill since each strike of the corkscrew is considered an attack.
• Thorny Cracked Tear boosts the damage of the Skill.
• Regalia of Eochaid has the same Skill, but that Weapon does less damage since it has lower Attack Rating. It also scales with Dexterity, instead of Strength, but has worse scaling in general even though it has C in Arcane Scaling.
• Eochaid's Dancing Blade does predominantly Physical Damage, with some Magic Damage, but not a lot.
• Although this weapon's skill does considerable damage, it is often risky to use it against larger enemies such as bosses, due to their resistance to stuns and knockdowns. Against lighter enemies and NPC-type enemies, the skill can effectively stunlock them, dealing the full damage and knocking them down with the final hit of the spin (not the swing performed after the spin). Some larger enemies such as Banished Knights will not be stunned by the skill, but if hit by the final hit of the spin will still be knocked down, so using the skill early before they enter melee range can help to achieve this.
• One of the 9 Legendary Armaments.
• NOTE: As of Patch 1.09, the scaling values of this weapon were changed. Please refer to the Upgrades Table of this weapon below. Additionally, speed, range, recovery time and guard counter speed of Greatswords weapons has increased. 

Marais Executioner's Sword PVP Poise Damage Values in Elden Ring

Patch 1.10 adjusted PVP Poise Damage of all Weapons including some Spells and Incantations. Please take note that these adjustments are exclusive to PVP.