Clash of the Titans

There are some gaps - I'll update them when they are filled

You cannot 100% this list through Story mode - most can only be picked up via Challenge Quests. Those marked "Story" cannot be missed as long as you successfully Sub Weapon Seize every new enemy you meet.

Weapon - Enemy - Challenge Quest

Dual Swords
Rusty Blade - Bones - Mount Of Idols
Ceremonial Blade - Skeleton Soldier - Mount Of Idols
Butcher's Blade - Satyros/Savage Soldier - Desert Of the Djinn
Savage Blade - Tribal General - Desert Of the Djinn
Durandal - Horn General - Enemy Remnants
Serrated Kopis - Dark Savage - Desert Of the Djinn
Warrior's Might - Dark General - Enemy Remnants
Sentry's Sword - Centaur/Sable Centaur - Norn Mountain
Falx - Centaur Slayer - Twin Blades In The Mist
Flesh Ripper - Dark Centaur - Norn Mountain
Akinakes - Death Soldier - Argos Castle Area
Cursed Blade - Calibos - The One- Armed King
Leonis - Pride Of Ixion - Twin Bladed Cavalry
Hoplite Sword - Dark Soldier - Medusa's Temple
Fang Of Tartarus - Pride Of Ixion - Twin Bladed Cavalry
Blade Of Darkness - Kraken - Shadows In The Depth

Hammer
Skull Hammer - Bone Warrior - Mount Of Idols
Minoan Hammer - Fallen Warrior - Mount Of Idols
Spiked Club - Skeleton Warrior - Streets Of Argos
Iron Hammer - Satyros Warrior - Desert Of The Djinn
Carpricorn - Savage Warrior - Desert Of The Djinn
Centaurian Satyros Idol - Tribal Destroyer - Desert Of The Djinn
Hammer Of Hephaestus - Dark Destroyer - Revenge Of The Satyros
Cyclopean Maul - Polyphemus - Son Of Poseidon
Foul Play - Death Warrior - Argos Castle Area
Hand Of Tartarus - Sand Serpent - Chthonic Terror

Axe
Crude Axe - Bone Mauler - Streets Of Argos
War Axe - Skeleton Mauler - Streets Of Argos
Headsman's Axe - Horn Berserker - Enemy Remnants
Idaea - Dark Beserker - Enemy Remnants
Bronze Edge - Satyros Mauler - Desert Of The Djinn
Metal Hatchet - Savage Mauler - Desert Of The Djinn
Goat Edge - Tribal Berserker - Desert Of The Djinn
Flat Axe - Death Mauler - Argos Castle Area
The Maw Of Tartarus - Chimera - The Desert Rowdy
Axe Of Themis - N/A - Awarded at 98% collection

Bow
Wooden Bow - Bone Archer - Streets Of Argos
Horn Bow - Skeleton Archer - Streets Of Argos
Apollyon Bow - Satyros Archer - Desert Of The Djinn
Hunter's Bow - Savage Archer - Desert Of The Djinn
Finger Of Thanatos - Tribal Assassin - Desert Of The Djinn
Bow Of The Monocerous - Horn Assassin - Revenge Of The Satyros
Sagittarius - Dark Assassin - Revenge Of The Satyros
Bone Bow - Death Archer - Argos Castle Area
Gorgon's Gaze - Medusa - Celestial Beauty
Bow Of Eros - Dark Archer - Argos Castle Area
The Talon Of Tartarus - Medusa - Celestial Beauty
Bow Of Artemis ??? - ???

Martial Arts Core
Spirit Of Argos - ??? Spirit - Story - Chapter 2
Hydra Soul - Basilisk - Story - Chapter 2
The Brothers - ??? Spirit - The Underworld
Libra - Talos - Medusa's Temple
Demeter's Touch - Dark Talos - Medusa's Temple

Flame Core
Flame Core - ??? - Story - Chapter 3
Arietis - ??? - Story - Chapter 7
Cereberusian Flare - Dioskilos - Story - Chapter 7
Antares - ??? - ???

Underworld Core
Cursed Orb - ??? - Story - Chapter 1
Orb Of The Nameless - ??? - Story - Chapter 6
Geminorum - ??? - Story - Chapter 4
Spirit Of Ambition - ??? - Story - Chapter 4
Will Of Tartarus - ??? - ???
Chaotic Bane - ??? - Story - Chapter 7
Essence Of Hatred - Kraken - Story - Chapter 10

Feather
Leathery Wing - Harpy - Streets Of Argos
Harpy Feather - Ornis - Streets Of Argos
Succubus Wing - Succubus - Norn Mountian
Chimera Wing - Chimera - The Desert Rowdy
Altair - Cockatrice - The Underworld
Virginis - Lamia - Argos Castle Area
Erinyes Feather - Fury - Argos Castle Area

Tail
Poison Stinger - Scorpion - Story - Chapter 4
Discourager - Scoropioch - Story - Chapter 4
Deneb - Scorpion - Story - Chapter 7
Scorpio - Scoropion - Story - Chapter 8
Serpent Of Medusa - Medusa - Story - Chapter 8

Healing Core
Caduceusian Core - ??? - Story - Chapter 1
Essence Of Vitality - ??? - ???
Essence Of Quartz - ??? - Story - Chapter 4
Aquarius - ??? - Story - Chapter 7
Iliotropio - N/A - Awarded at 98% collection

Barrier Core
Barrier Core - ??? - ???
Veil Of The Protector - ??? - ???
Absolute Wall - Zeus - Story - Chapter 10

Harp
Piscium - Siren - Mount Of Idols
Vega - Fire Maiden - Medusa's Temple
Lyre Of Apollo - ??? - ???
Call Of Tartarus - Draco - The Stubborn Squad Leader

Some weapons require you to use certain cores on the enemy to make the enemy go into weapon seize mode such as the
flame core- for the siren (mermaid),
flame core- cockatrice (dragon),
while im pretty sure the flame siren needs to be hit with an underworld core