The description of the initial battle during the birth of Slaanesh
Isha growing a forest on Terra, complete with a river. Later, her cleansing Chtonia's atmosphere and growing a forest there as well.
Horus flat out telling a Custodian to bug off the moment he is told he is supposed to live in his own chambers instead of with his friends.
Reclamation
Isha embracing her war goddess aspect for the first time since the War In Heaven to defeat Be'lakor.
When Isha has Be'lakor dead to rights, he has one option to save himself: make himself a slave to the Chaos Gods again in exchange for the power to save himself. He makes the choice to let Isha kill him rather than be their puppet. Even Isha feels a modicum of respect for that.
