|Sources||A Planeswalker's Guide to Alara, The Soul of the World |
Progenitus is a being of enormous power on the plane of Alara who is worshiped as a Hydra-God.   According to the Anima's visions, it had become bored with creation and unleashed five storms to consume it: Wildfire, Earthquake, Windstorm, Flood, and Void. His actions were stopped by the elf Cylia who forced it, using a poisoned dagger, to assume the form of a five-headed hydra avatar to stop his plans. This tale is likely an apocryphal account of the events that took place during the Sundering.
Due to the lack of blue and black mana in the Valley of the Ancients, the place where Progenitus resettled, two of its heads withered away, and the hydra was doomed to slumber under Naya's soil for many years. 
Millenia later, he appeared to Mayael, the newly appointed Anima, and asked to speak with Cylia, unaware that she had perished millenia ago. His image was soon co-opted by Nicol Bolas, prior to the Conflux, to tell Mayael to build up an army to counteract Sarkhan Vol's invasion of dragons, thereby creating a greater expenditure of mana to fuel the Maelstrom.
Regardless of Bolas's plans, the reunification of Alara reawakened Progenitus.
Quoted or referred to in:
- Jenna Helland. (January 21, 2009.) "The Soul of the World", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Magic Arcana. (January 22, 2009.) "Sketches: Progenitus", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Magic Arcana. (February 24, 2009.) "Forebodings of Progenitus", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Magic Arcana. (February 23, 2009.) "Ask Wizards: Twitter Edition", Daily MTG, magicthegathering.com, Wizards of the Coast.
|Expansions: Shards of Alara | Conflux | Alara Reborn|
|Shards: Bant | Esper | Grixis | Jund | Naya|
|Characters: Ajani | Elspeth Tirel | Nicol Bolas | Rafiq | Sarkhan Vol | Tezzeret|
|Others: Etherium | Jazal | Kathari | Leotau | Maelstrom|