# Chapter 4: Nourishment · Soul Core (Advanced · Passive)
Soul Severing Shadow's advanced ability. Upon mastery, this soul core cannot be switched out and will occupy three soul core slots. After mastering this soul core, it will permanently strengthen all soul cores you have currently mastered (enhancement range of 1.5 to 3 times, varying according to the characteristics of different soul cores).
Your Soul Severing Shadow ability soul core slots remaining: 2/6.
Soul cores mastered: Azure Steel, Rapid, Soul Slash, Blade Spirit.
Reminder: Your remaining soul core slots are insufficient to master this ability.
Reminder: This is a high-level Law Destruction ability, requiring payment of 20 Law-Destruction skill points to master.
Reminder: Soul cores are a branch of the Soul Severing Shadow ability. Mastering soul cores does not occupy "Law-Destruction skill slots," but rather "soul core slots."