The Hollow Core recovered from the Harrower is a crafting component for five pieces of Hollowforged equipment. These pieces are crafted, not dropped directly by the boss, and each has its own abilities. All five are unbreakable.
Crown of the Hollow
The Crown grants clear vision in darkness and immunity to Blindness and Darkness. Looking directly at an enemy for two seconds can expose it, making it more vulnerable to your attacks. Absolute Sight reveals nearby hostiles, while The Final Witness marks nearby enemies for increased damage.
Carapace of the Unbroken
The Carapace reduces incoming damage and protects against fire, lava, poison, and wither. Its Unbroken ability temporarily strengthens that protection. Refusal is an automatic rescue from a lethal hit, with a cooldown.
Greaves of the Stillborn
The Greaves resist knockback and movement penalties. Standing still on solid ground activates Anchored, improving melee combat and slowing nearby enemies. Sovereign Ground extends attack reach and controls approaching enemies for a limited time.
Treads of the Worldbreaker
The Treads increase movement speed, prevent fall damage, and allow safe movement over powder snow. Falling from sufficient height creates an Aftershock. Cataclysm launches the wearer upward for a devastating landing attack.
Worldshard
Worldshard is an enormous two-handed hammer. Fully recovered melee strikes pierce armor and create a short shockwave. Fracture the Earth sends a powerful wave forward, while The Last Argument is a charged area attack. Holding Worldshard disables off-hand actions.
Controls
Open Options → Controls → Hollowforged to review or rebind the abilities. The Crown's default binding is V, and the Carapace's is J; other ability bindings may be unbound until configured. The Crown distinguishes a tap from a hold. Sovereign Ground activates by holding sneak while stationary on solid ground; Cataclysm uses sneak and jump. Worldshard abilities use its held-item controls.
For exact cooldowns, ranges, and effects, expand each item's tooltip in-game by holding Shift. The in-game tooltip is the authoritative quick reference for the installed version.
Source reference: src/main/resources/assets/lc_hollowforged/lang/en_us.json and AbilityControls.java.