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Chrono Wiki

Mastermune (グランドリーム , Grandream?) is Serge's ultimate weapon in Chrono Cross. It has a near-perfect critical hit rate. It can be found after defeating Dario on the Forbidden Island. Mastermune deals extra damage to Demon, Dragon, Floating, Human, Marine, Matter, Soft, and Zombie enemy-types. Mastermune is a further nod to master swordsmith Masamune (hence Master + mune), widely regarded as the greatest Japanese swordsmith to have ever lived.

Transformed from the holy sword, Masamune, its inhabitants (Masa & Mune) awaken and dedicate themselves to be helping Serge. Doreen melds with them to form the weapon. When it is equipped and Serge uses his FlyingArrow tech, Masa & Mune can be seen behind him powering it up.

Chrono Cross Weapons
Swallows Sea Swallow · Copper Swallow · Steel Swallow · Silver Swallow · Stone Swallow · Mastermune · Spectra Swallow
Swords Bone Sword · Bronze Sword · Hero's Blade · Steel Sword · Silver Sword · Stone Sword · Einlanzer · Viper's Venom · Slasher · Spectral Sword · Einlanzer (Upgraded)
Daggers Ivory Dagger · Bronze Dagger · Iron Dagger · Mythril Dagger · Denadorite Dagger · Prism Dagger
Gloves Bone Glove · Bronze Glove · Iron Glove · Mythril Glove · Granite Glove · Spectral Glove
Axes Bone Axe · Bronze Axe · Iron Axe · Silver Axe · Great Hammer · Stone Axe · Master Hammer · Rainbow Axe
Staves Silver Staff · Stone Staff · Spectral Staff
Shots Bronze Shot · Steel Shot · Silver Shot · Stone Shot · Private Deck · Pack of Lies · Prism Pellets
Utensils Spatula Ca20 · Besom Cu29 · Ladle Fe26 · Frypan Ag47 · Saucepan Si02 · Crystalpan C6
Guns Ferrous Gun · Argent Gun · Denadorite Gun · Shockwave Gun · Plasma Gun · Spectral Gun
Lures Iron Lure · Mythril Lure · Stone Lure · Prism Lure
Boomerangs Steelerang · Silverang · Rockerang · Prismarang
Rods Porcelain Rod · Brass Rod · Iron Rod · Mythril Rod · Denadorite Rod · Floral Rod · Rainbow Rod
Picks Porcelain Pick · Brass Pick · Iron Pick · Mythril Pick · Pebble Pick · Prism Pick
Carrots Carrot (Weapon) · Beta Carotene