Snowflower

Spoilers ahead! Snowflower is an NPC and the mother of the protagonist and Stonefall.

After Level 6
When the protagonist sleeps after completing level 6, they will be taken to StarClan rather than the 7th level. Snowflower appears and immediately senses the protagonist's desire to get revenge for her death. She warns them not to give in to their hatred, as nothing they can do will change the past.

She will give the protagonist a fragment of the Eternity Crystal, a powerful object designed by StarClan to combat the Apocalypse Crystal. She instructs them to continue to go to the Dark Forest and continue to weaken the crystal by forcing Rockfoot to revive himself. When the Eternity Crystal changes to red, they can destroy both crystals simultaneously using their opposing energies.

Post-Game Quest
After Raventuft is defeated, Snowflower appears before he can increase his power a second time. Having absorbed the Eternity Crystal's power, she kills Raventuft by destroying the Apocalypse Crystal power in his soul. Unfortunately, this action kills Snowflower as well, but before her death she confesses to the protagonist about their father's BoulderClan allegiance. She explains how a BoulderClan patrol had found the two of them together, and it is implied that her mate had been punished by death. Blaming herself, she continued to live her life in despair until the day of the BoulderClan attack where she willingly gave her life to protect the protagonist and Stonefall, feeling it was the only way she could atone for her actions. But upon arriving in StarClan, she finds that her mate was not present there, making her feel even worse about her life with him. In the seconds before she fades away, she pleads her children not to make choices they will regret, and to live a happy and proper life in her stead.