Fusion Material

Also see Fusion Summon, Fusion Monsters, Fusion Material Monsters, Fusion Deck, Fusion Substitute Monsters, Fusion Deck Zone, Fusions (GX1-BP).

Fusion Material Monsters are monsters that are used for the Fusion Summon of a Fusion Monster. These Fusion Material Monsters are listed on the card. While Fusion Material Monsters are usually specific monsters, occasionally, the required monsters are more vague, such as Five-Headed Dragon, simply requiring any 5 Dragon-Type monsters to Fusion Summon it.

You can also use Fusion Substitute Monsters, such as "The Dark - Hex-Sealed Fusion".

Also, If you have a monster such as Five Headed Dragon that you wish to Fusion Summon, as it has a vague requirement, not a specific one. Therefore, you cannot use a Fusion substitute Monster, such as The Dark- Hex Sealed Fusion for a Monster such as F.G.D.

Another example is this:

Hand: Gorz, The Emissary of Darkness, Dark Fusion, Evil Hero Malicious Edge, The Dark - Hex Sealed Fusion

Fusion Deck: Evil Hero Malicious Fiend

When playing Dark Fusion, you can use Gorz as the level 6+ monster, but since there are hundreds of 6+ Fiends, The Dark cannot fill in the blank. The Dark CAN, however, substitute for Malicious Edge, not the 6+ Fiend.