Beastly Core Crystal

The Beastly Core Crystal is a unique Core Crystal in Xenoblade Chronicles 2. It is obtained upon defeating the Elder Arachno atop Soulcrown Summit in the Kingdom of Uraya during Chapter 3. Although it is obtained during Chapter 3, the Beastly Core Crystal cannot be used until Chapter 4. Upon resonating with the Beastly Core Crystal, a Driver will awaken the Rare Blade Wulfric.

Trivia

 * The Beastly Core Crystal is one of only two Unique Core Crystals which cannot be opened until certain progress has been made in the Main Story, the other being Roc's Core Crystal.