Ex Nihilo: Sequentia is a port to 1.15 of Ex Nihilo: Creatio for 1.12, which in turn was a fork of Ex Nihilo: Adscensio for 1.10, which was a continuation of Ex Nihilo for 1.7.10.
Ex Nihilo: Sequentia is licensed under the MIT license (see the license file)
The Crushed Sky Stone texture is derived from the Sky Stone texture in Applied Energistics 2, and is thus licensed under CC-BY-NC-SA 3.0. The original texture was created by AlgorithmX2 et al. And is used with attribution in line with the license.