Use something with high "Poise Damage." The Guardian’s Greatsword or Heavy Mace are excellent for triggering the new staggering animations.
You can no longer hide inside the ankle textures to avoid the Stomp shockwave. giantess of abyss guide patched
You must stay mobile. When she raises her hand for the Abyssal Slam , look for the white ripples on the water—that’s your safe zone. Use something with high "Poise Damage