After the First Thunder proposes an eldercare and memorial landscape along the shore of Oneida Lake, where living, healing, and end-of-life rituals coexist within a shared ecological framework. Inspired by the Haudenosaunee ceremony of Wáhtaˀ Kayuˀkwaʌtho, the project understands aging and death not as isolated medical conditions, but as part of a continuous cycle of renewal, gratitude, and transformation. A regional network of community care stations supports aging residents around the lake, while a lakeside memorial landscape provides spaces for reflection, gathering, and seasonal ritual. Architecture unfolds gradually along the calm horizontal edge of the lake, integrating water, forest, and public life into a therapeutic environment. The project reimagines care and mortality as visible, communal, and deeply connected to the rhythms of land and season.