Here's why:
* Fusion Summoning: Fusion Monsters are summoned by combining specific materials from your hand or field. This process requires a Fusion Spell Card and the appropriate monsters.
* Graveyard Limitations: The Graveyard is primarily used for banished cards, discarded cards, and monsters that have been destroyed. There is no general rule that allows for Special Summoning from the Graveyard, except for certain specific cards or effects.
Exceptions:
There are some cards that can bring Fusion Monsters back from the Graveyard under specific conditions:
* "Call of the Haunted": This spell card allows you to Special Summon a monster from your Graveyard, but it only works for monsters that have a Level. Many Fusion Monsters have no Level.
* "Reborn": This card can be used to Special Summon a monster from your graveyard, but it also has specific requirements and limitations.
* "Monster Reborn": Similar to "Reborn", it can Special Summon a monster from the graveyard with limitations.
* Certain Fusion Monster Effects: Some Fusion Monsters have specific effects that allow them to be Special Summoned from the Graveyard under certain conditions.
In Conclusion:
While there are exceptions, the general rule is that Fusion Monsters cannot be Special Summoned from the Graveyard. They must be summoned by a proper Fusion Summoning process using a Fusion Spell Card and the appropriate materials.