Giga Battle Nizer

Giga Battle Nizer (ギガバトルナイザー) is a giant polearm variant of the Battle Nizer that is more powerful than a regular Battle Nizer as it can revive an army of hundred monsters that is used by Ultraman Belial. It was temporarily destroyed after the Ultras battle with Beryuduora and restored by Reibatos before Ultraman Belial receives it.

Past
After Belial's exile from the Land of Light and fusing with Alien Reiblood, Belial received this item and possible revive monsters with this item. However, when Belial was defeated by Ultraman King, it was sealed in the valley of flames under the Monster Graveyard guarded by an Ex-Zetton

Ultraman Mebius Gaiden: Ghost Reverse
As this item causes monsters to be revived including the Four Heavenly Kings of Alien Empera and its potential to revive the evil emperor, Ultraman Mebius was sent to retrieve it. When Mechazam appeared to help Mebius, he was revealed to have been a crucial element in the Emperor's resurrection. By uniting the Giga Battle Nizer with Zamu, Empera would be revived. This did happen, but in a fight with Mebius and Ultraman Hikari, Mecha Zamu sacrificed himself to keep Empera from ever returning with the Giga Battle Nizer being lost in space until it was retrieved by an Alien Zarab to form an alliance with Ultraman Belial.

Mega Monsters Battle Ultra Galaxy Legend Movie
Belial received this item from Alien Zarab but Belial betrayed Alien Zarab and destroy him with this weapon. Belial fought against the Ultras with this weapon and using it to revive his monsters. After Belial's defeat as Beryuduora by the Ultras, this item was destroyed.

Ultra Fight Orb
When Reibatos arrive at the Monster Graveyard, he used his powers to restore this weapon in hopes of restarting Ultraman Belial's plan of reviving 100 monsters to rule the universe. Upon Reibatos defeat by Ultraman Orb, the Giga Battle Nizer, dissappears and was received by Ultraman Belial later on.

Ultraman Geed
Belial wields this weapon in the battle with the Ultra Warriors. This weapon was used as a detonator to summon the Super-dimensional Eradication Bomb that allows Belial to trigger the Crisis Impact. He arrives on Earth with this weapon and use it in battle with Zero and Geed. When Belial transforms into Belial Atrocious, he also wields this weapon.

Weakness
A single Battle Nizer was able to control it and the monsters used. This is proven when Rei used his Battle Nizer to temporarily paralyse Beryuduora giving the Ultras an opening to destroy the monster.

Gallery
To be added.

Trivia

 * One possible reason of how Ultraman Belial obtained this weapon, since all users of the Battle Nizer are Reiyonx, they may simply appear due to their Reiblood Genes.
 * Out of all Battle Nizers, the Giga Battle Nizer may only have one existed as this was destroyed upon Beryudora's defeat then reconstructed by Reibatos and only to be return to Belial's hands.