"Eldians" and "Marleyans" are two prominent groups from the manga and anime series "Attack on Titan" (Shingeki no Kyojin) by Hajime Isayama. Here’s a comprehensive overview of these groups and their roles in the story:

### Eldians

1. **Origins and History**:
   - The Eldians are descendants of Ymir Fritz, who is said to be the first person to gain the power of the Titans. According to legend, Ymir obtained this power from a mysterious source, often referred to as the "Source of All Living Mat 

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