Which game introduced the character Atreus to the God of War series?

God of War (2018) introduced the character Atreus to the God of War series.

Atreus is Kratos's son and the second playable character in the 2018 game. After the death of his mother, he travels with Kratos to spread her ashes from the highest peak in the realms. Their journey forms the emotional core of the game's Norse setting.

Atreus begins as a young archer who can assist Kratos in combat and solve certain environmental puzzles. His abilities and understanding develop throughout the story, making him more than a supporting companion.

The character returns in God of War Ragnarök, where his identity, independence, and connection to the giants become central to the plot. Atreus is not Deimos, Kratos's brother from the Greek-era games, although both characters are important to Kratos's family history.