The blade's name comes from its owner, Ultraman Max and the fact that it serves as a blade. Thus Maxium Sword.
Like all Crest Weapons, the Maxium Sword is stored on the user's head as a crest. It can be thrown and controlled mentally and cut through even dense objects. Like others, it can be used in hand-to-hand combat, but can also fire light bullet at an enemy and act as a defense against enemy energy attacks.
Unlike others, it seems to have the natural ability to multiply itself, each copy under the user's mental control.
- Sword Slash (ソードスラッシュ Sōdo Surasshu): Max's main attack when using the Maxium sword. A deadly attack that splits opponent's down the middle.
- Maxium Sword Cloning Shoot (マクシウムソード分身シュート Makushiumu Sōdo Bunshin Shūto): Max can multiply his Maxium Sword into many copies, decimating the opponent.
- IF: After being thrown with Max's Maxium Sword, the fourth form IF adapted into the attack and produced two identical copies of the blade. However, it launches straight into the target and had not returned to IF.
- The Maxium Sword is the first Crest Weapon that does not completely remove its owner's head crest.
|Crest Weapons||Eye Slugger | Vezard | Maxium Sword | Zero Sluggers | Xlugger | Orb Sluggers | Geed Slugger | R/B Slugger|
|Bracers and Bracelets||Ultra Bracelet | Ultra Converter | King Bracelet | Stratos Edge | Armed Nexus | Mephisto Claw | Max Spark | Max Galaxy | Mebius Brace | Knight Brace | Ultra Zero Bracelet | Strium Brace | Ultra Fusion Brace | Taiga Spark | Plasma Zero-let|
|Armors||Protectors | Cosmo Techtor | Grantechtor | Arb Gear | Techtor Gear | Ultimate Aegis | Zero Slugger Gear | MonsArmor|
|Others||Ace Blade | Ultra Array | Ultra Magic Ray | Leo Nunchaku | Ultra Mantle | Giga Battle Nizer | Ginga Spark Lance | Knight Timbre | Orbcalibur | Orb Slasher | Geed Claw | King Sword | Giga Finalizer | Orb Dark Calibur | Orb Ring NEO | R/B Kourin | Taiga Tri Blade|