How to Obtain Freyja's Greatsword
Freyja's Greatsword can be acquired via two methods:

Through Freyja's Questline:

Step 1: Deliver Freyja's letter, prompting her to Elden Ring Items move to Enir-Ilim.
Step 2: Assist or fight against her during the battle against Leda and her allies. After the battle, loot Freyja’s corpse to claim the Greatsword.
Non-Questline Method:

Step 1: Progress through the Shadow of the Erdtree DLC until the battle with Leda and her allies.
Step 2: Head to the Shadow Keep, Storehouse (Seventh Floor), where you’ll find Freyja's Greatsword on the ground where she was last seen.
Freyja's Greatsword Stats & Scaling
Physical Attack: Very high
Required Attributes: Strength 28, Dexterity 14
Scaling: Primarily scales with cheap Elden Ring Items Strength (A scaling with Heavy Affinity)
Skill: Spinning Slash (can be changed)