The third act of Insidious: Out of the Further discloses that Ingrid's suicide in 1999 was not an act of madness, but a desperate ritual sacrifice. Ingrid had also been a carrier who was relentlessly hunted by Cyrus Lam; she chose to take her own life specifically to sever Cyrus's tether and seal him within The Further to spare Gemma. Cyrus orchestrated Maya finding the relics to reawaken the dormant bloodline connection and force Gemma into opening a new doorway.
Assisted by Claire channeling Elise Rainier, Gemma intentionally projects into Cyrus's spectral realm to rescue Maya from being dragged across. Rather than letting Cyrus use her to pull him into reality, Gemma uses her carrier gift to tether Cyrus to the mortal physical remains of his earthly artifacts in the living room. As Claire and Maya incinerate the artifacts in the living world, the psychic backlash destroys Cyrus's astral form, casting him into oblivion. The film ends with Gemma and Maya moving out of the childhood home to finally begin a fresh life free of ancestral shadows.