In Curse Of Strahd, Atlas went to the land of Barovia at Umori's behest, and was killed by Baba Lysaga in Berez. As he died, he saw Joana reaching out to him, ready to rejoin his soul with her father.
The daughter of Atlas Atruvian, Joana's mother passed away when she was young. She was raised under the sole care of her father and the Church of Umera, being raised in his minor cathedral on the outskirts of Emblem. Though her father was kind to her, he was busy with his duties as a vicar, and she grew up questioning Umyra's fundamental tenets of justice and protection. In her teenage years, she began to grow more inquisitive on the nature of death, and her curiosities were unsatisfied by the answers that the church-goers would give.
She found answers when exposed to the cult of Ixhis, devoted to an exploration of death and with different opinions on life's purpose. She began to grow disillusioned, and she ultimately got into many theological arguments with followers of Umera. This sowed discord between her and her father; Atlas was caught between being an understanding parent and the stewardship of his church's virtues. This threatened his position with his followers and his goddess, and Joana grew more distant from her father, delving into cultist activities.
Eventually, Joana led the cult in through backways that she had privy to as the daughter of a vicar, and allowed malcontents to take over the church. Atlas caught her, but she seemed confused, as if magically charmed, and began asking for his help. He hesitated, not knowing whether to go after his daughter or defend his church, and ultimately was unable to save either as the cultists burned his cathedral and Joana was caught in the inferno.