Etezza, the family of spies and assassins are professionals in the field of gathering and selling information.
D.I. is the name of the information related quest lodge, ran by the Etezza family, which specialized in accepting and offering intelligence gathering quests and selling information.
There are two spells specific to Etezza family mentioned in Chapter 74. Façade & Mirage. Based on the Morph and Light spells, they were created by the god ancestor of the Etezza family who spellcrafted countless rules into the spell, defining mysterious laws.