Ashes: Rise of the Pheonixborn - Children of Blackcloud - Rules of Play says:

At the top of the world sits Blackcloud – a bleak and venerable city. There rules Brennen, a fifteen year old wielding merciless blood magic, seeking to restore his family and city to the terrifying glory of their ancient heritage.

The Children of Blackcloud deck, featuring new Phoenixborn Brennen Blackcloud, is a full, ready-to-play Ashes expansion deck with all-new cards including 1 conjuration.

Brennen requires 10 Ceremonial (black) dice to play, which are included in the Ashes: Rise of the Phoenixborn base set.

Ashes: Rise of the Pheonixborn - Children of Blackcloud Review:

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