Ruins Greatsword is a Colossal Sword in Elden Ring. The Ruins Greatsword scales primarily with Strength and Intelligence and is a good Weapon for its additional magic damage. 

Elden Ring Ruins Greatsword Notes & Tips

• Weapon Skill: Wave of Destruction
• This weapon cannot be infused with Ashes of War
  
• Cannot be enchanted with Magic nor boosted by Consumables
• Ruins Greatsword can be upgraded by using Somber Smithing Stones 
• Wave of Destruction: The weapon skill damage scales primarily with weapon level. There are minor increases in damage from STR levels, and the least increase from INT levels.
• Charged strong attacks cause a small burst of gravity magic upon slamming the ground. This slam causes additional damage, as well as staggering enemies in close proximity. This doesn't cost FP, but consumes more Stamina than normal charged heavy attacks.
• At 80 Strength and 18 Intelligence, the Ruins Greatsword has 922 Attack Rating.
• If the player doesn't meet the stat requirements to wield the weapon, the following penalties are applied:
  
  • They will become unable to use the Weapon Skill.
  • Their stamina cost on each attack is increased.
  • They cannot benefit from the weapon's magic scaling.
  • However, meeting the STR requirement allows the physical damage and scaling of the weapon remain the same. The base magical damage also remains unaffected.
    
    • This could prove useful for pure Strength builds if the player manages to acquire it early in the game, provided they can find the Somber Stones to upgrade it.
• Sell Value:  

   1000

• Normally you can rotate to attack in any which direction during the final stages of the animation but with this weapon the 1H R2 is seemingly locked into whatever direction you were facing when pressing R2. (This bug been patched as of 1.07).
• One of 9 Legendary Armaments.
• Note: As of Patch 1.08, the Speed of Crouching and Rolling Attack has been slightly increased.
• 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, the speed of guard counters for this weapon has increased
• Other notes and player tips go here

Ruins Greatsword 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.