Principia Sardonica is the second studio album by the American heavy metal band Rigor Sardonicous. It was released in 2004 on Paragon Records and is the band's first full-length album in 5 years. The album contains the 15-minute track "Possession".
| Title | Translation |
|---|
| 1. | "In Autumn Twillight" | | 3:43 |
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| 2. | "The Dead" | | 7:04 |
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| 3. | "Sleepless" | | 5:37 |
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| 4. | "Risus Ex Mortuus" | The Laughter Died | 8:03 |
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| 5. | "Phases of Death" (instrumental) | | 6:57 |
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| 6. | "Wall of Darkness" | | 6:52 |
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| 7. | "Soulless Extinction" (Dimentianon cover) | | 8:19 |
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| 8. | "Possession" | | 15:04 |
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| Total length: | 61:41 |
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- Joseph J. Fogarazzo – guitars, vocals
- Glenn Hampton – vocals, guitars, bass
