The Sauptika Parva (Tenth Book) contains -
Sauptika Parva:
Ashvatthama launches a night attack on the sleeping Pandava camp and massacres its warriors.
Aishika Parva:
Ashvatthama and Arjuna unleash divine weapons against each other, leading to the destruction of the Pandavas' heirs and the saving of Parikshit.
The Stri Parva (Eleventh Book) contains -
Vishoka Parva:
The survivors mourn the dead as the devastation of the war becomes clear.
Stri Parva:
The women of both sides grieve for their fallen husbands, sons, and relatives.
Shraddha Parva:
Funeral rites and offerings are performed for those who died in the war.
Jalapradanika Parva:
Sacred water offerings are made to honor the departed warriors.
The Shanti Parva (Twelfth Book) contains -
Rajadharma-anusasana Parva:
Bhishma explains the duties, responsibilities, and ideals of kingship and leadership.
Apaddharma-anusasana Parva:
Bhishma teaches how to act wisely and ethically during times of crisis and hardship.
Moksha-dharma Parva:
Bhishma discusses spiritual wisdom, the nature of the soul, and the path to liberation.