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When Hel managed to somehow get rid of Kireina in an unexpected way, she thought that things would become much easier without the All-Devouring Supreme Goddess of Chaos and Demise, though, she was terribly wrong. Her family had inherited her powers as, in the very last minute, she divided her entire Divine Realm into four Fragments, giving them to Rimuru, Zehe, Nesiphae, and Brontes.
Within them, a great fragment of Kireina's true power was carried, and with all the things and powers she left behind, even including Divinities, Daos, and even the ever-growing and developing Realm Core of the Realm of Vida, which was completely assimilated into her Divine Realm by now, their power was constantly surging!
Check "The Protagonist's Sister Is Actually the Strongest"!