Link to the Mod Mahou Tsukai: https://www.curseforge.com/minecraft/mc-mods/mahou-tsukai
This Resource Pack changes the Model of Mystic Staff of Explosive Mana Condensation, from Mahou Tsukai, into Gilgamesh's Noble Phantasm Ea: Sword of Rupture.
Since this is a Resource Pack, it does not change how the staff works.
And, since it is a Resource Pack, only those with it applied will see the staff with Ea's Model.
It does, however, change the item's name to "Ea: Sword of Rupture" and "Scroll of Ea: Sword of Rupture", but it doesn't change it's description in the guidebook to not create confusion with the mod progression.
Images:
