A variety of cards will fuse. The most common card that appears is Twin-Headed Thunder Dragon as it is the monster with the easiest and widest variety of Fusion Materials. To form Twin-Headed Thunder Dragon, you must fuse two monsters that have something to do with "thunder" or "lightning", and also something that relates to a "dragon". Note that the card does not have to be a Dragon-Type monster, as cards such as Metal Dragon will work. You must also make sure that at least one of the Fusion Materials have LESS ATK than Twin-Headed Thunder Dragon (2800), and has at least 1600 ATK. The latter is because fusing monsters that have less than 1600 will result in the formation of Thunder Dragon.
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In Yugioh Forbidden Memories, to summon ritual monsters you need to use the ritual card when you have the three required monsters on the field.
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Hoiguy
No you can not
It can be obtained as a reward from Meadow Mage or Jono.