Kulta
Kulta was the leader of the Skull Creatures, a group native to the island of Okoto, and operated from the City of the Mask Makers. Armed with a Mask Stealer Staff and Hook Blade, he possessed the ability to drain masks of their Elemental Powers and once held both the powerless Skull Mask and the Mask of Creation.

Kulta, also known as the Skull Grinder or Lord of the Skulls, was the leader of the Skull Creatures and one of MakutaMakuta: species, title, and TeridaxMakuta means three things in the Matoran Universe: the Antidermis species Mata Nui created, the Brotherhood rank, and most often Teridax himself.'s minions on the island of OkotoOkotoOkoto is a world whose known inhabitants include the Toa, the Mask makers, and the Protectors.. He wielded a Mask Stealer Staff and a Hook BladeHook BladeThe curved cutting weapon issued to the upper ranks of the Skull Army on Okoto, carried by Kulta as a side arm beside the Mask Stealer Staff and wielded in greater numbers by Skull Slicer in the arena., a weapon able to cut through solid stone and to hook onto an opponent's mask to pry it loose.
Kulta was originally the leader of the Skull Raiders, a band of pirates who plagued Okoto until they were stopped by the Mask Makers and the Protectors. Makuta later approached Kulta and his people, offering them an alliance against EkimuEkimu the Mask MakerEkimu is the Mask Maker of Okoto in the 2015 BIONICLE reboot, brother of Makuta, who knocked the Mask of Ultimate Power from his brother's face and slept for thousands of years before the Toa woke him.. When the energies of the Mask of Ultimate Power were unleashed, Kulta and his compatriots were trapped beneath Okoto's surface, where they built a city in the depths before finding a way back to the surface and renewing their allegiance to Makuta. While Kulta took charge of operations in the City of the Mask MakersThe Mask MakersThe two legendary craftsmen of Okoto, Ekimu and Makuta, who forged the island's Kanohi and whose rivalry ended in the cataclysm at Capital City., his subordinate Axato was left in command of the Skull Raiders' city.
Acting on Makuta's influence to recover the Masks of Power, Kulta obtained the Mask of Creation and carried it to Ekimu's forge to be melted down. When the ToaToa (2001)Biomechanical heroes bonded to elemental powers and masks. Not born, but chosen and transformed. arrived, the Skull Grinder donned the Mask of Creation, and Ekimu directed the Toa to distract him while he searched for pieces to rebuild his hammer. Though outmatched, the Toa delayed Kulta long enough for Ekimu to complete the weapon and defeat him.
Kulta later escaped and resurfaced when the Toa came to rescue a pair of young villagers held by the Skull Raiders. He joined the ensuing battle against the heroes, only for Ekimu to defeat him a final time.
Gallery

Images via BIONICLE Wiki (Biosector01)
Sources
- WikiKulta, Bionicle Fandom wiki cross-reference
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Followed from this entry
Hook Blade
The curved cutting weapon issued to the upper ranks of the Skull Army on Okoto, carried by Kulta as a side arm beside the Mask Stealer Staff and wielded in greater numbers by Skull Slicer in the arena.

The Mask Makers
The two legendary craftsmen of Okoto, Ekimu and Makuta, who forged the island's Kanohi and whose rivalry ended in the cataclysm at Capital City.

Ekimu the Mask Maker
Ekimu is the Mask Maker of Okoto in the 2015 BIONICLE reboot, brother of Makuta, who knocked the Mask of Ultimate Power from his brother's face and slept for thousands of years before the Toa woke him.

Makuta: species, title, and Teridax
Makuta means three things in the Matoran Universe: the Antidermis species Mata Nui created, the Brotherhood rank, and most often Teridax himself.

Okoto
Okoto is a world whose known inhabitants include the Toa, the Mask makers, and the Protectors.
Toa (2001)
Biomechanical heroes bonded to elemental powers and masks. Not born, but chosen and transformed.
Mentioned in47 entries
Ako
Ako was a young villager from the Region of Stone on Okoto, in the 2015 reboot continuity, who was carried off with Oda to the Skull Raiders' underground city and rescued by Ekimu and the Toa.
City of the Mask Makers: Home of Ekimu and Makuta
The City of the Mask Makers was a city on the island of Okoto, named for the brothers Ekimu and Makuta who dwelt there before the Battle of the Mask Makers. It fell to ruin and became the lair of the Lord of Skull Spiders before the Toa reclaimed it.
Ekimu the Mask Maker
Ekimu is the Mask Maker of Okoto in the 2015 BIONICLE reboot, brother of Makuta, who knocked the Mask of Ultimate Power from his brother's face and slept for thousands of years before the Toa woke him.
Gali, Master of Water: The Toa Who Closed the Rift
Gali of Okoto, from the 2015 reboot, was the Master of Water of the Toa, the team's mediator at the City of the Mask Makers, and the Toa pulled into the Shadow Realm who came back knowing how to banish Makuta again.
Harvali, the Jungle Archaeologist of Okoto
Harvali was the Region of Jungle archaeologist whose disappearance beneath the City of the Mask Makers preceded the second age of Okoto, and whose rescue by the Protectors during the campaign against the Skull Spiders unblocked the bridge that brought the villagers back to the capital.
Hook Blade
The curved cutting weapon issued to the upper ranks of the Skull Army on Okoto, carried by Kulta as a side arm beside the Mask Stealer Staff and wielded in greater numbers by Skull Slicer in the arena.
Ice Villagers
Okoto's northern tribe, pale and silver, sheltering in glacial valleys under Izotor through the Skull Spider incursions that troubled all six regions.
Jungle Villagers
The green tribe of Okoto's forest country, settled in the canopy and on the levitating islands under Vizuna. One of its villages was destroyed by Skull Spiders, and Bingzak walked out of it.
Kopaka, Master of Ice: The Chivalrous Toa of Okoto
Kopaka of Okoto, in the 2015 reboot continuity, was the Master of Ice summoned by the Protectors, the cold perfectionist who found his Golden Mask with Izotor and clashed with Tahu over who should lead.
Lewa, Master of Jungle: The Daredevil Toa of Okoto
Lewa of Okoto was the Master of Jungle summoned by the Protectors, the rebellious flier who quested for the Mask of Jungle in the Region of Jungle and bonded with Uxar in the second wave.
Lord of Skull Spiders
An oversized Skull Spider that guarded the ancient City of the Mask Makers and commanded the rest of its species through the Golden Mask of the Skull Spiders.
Makuta (2015)
Ekimu's brother and rival Mask Maker, who forged the forbidden Mask of Ultimate Power and was sealed in the Shadow Realm with Capital City.
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