A Moderatus (plural Moderati) is, after the Princeps, senior in rank aboard an Imperial Titan. They usually assist the Princeps to operate the weapons, motive systems, and void shields of the Titan as well as sensors. Like the Princeps, a Moderatus has a hardwired link with the Titan's manifold to access its systems. While a Moderati maybe more strongly connected than the Princeps with the systems they are assigned to operate, they are not as strongly connected to the Titan's Machine-Spirit, nor systems outside of their assigned station.
- Moderati Majoris — Normally in charge of a Titan's primary weapons.
- Moderati Minoris — Normally in charge of a Titan's secondary weapons.
- Moderati Primus Valian Carsomir — Stormherald, Imperator Battle Titan of the Legio Invigilata
- Canus — Sanctus Venator, Warhound Scout Titan of the Legio Gryphonicus
- Dekar — Sanctus Venator, Warhound Scout Titan of the Legio Gryphonicus
- Jonah Aruken — Legio Mortis
- Titus Cassar — Legio Mortis
- 1: Imperial Armour Update 2002, pg. 45
- 2: Betrayer (Novel)
- 2a: Dramatis Personae
- 3: Warlord: Fury of the God Machine (Novel)
- 4: Iron Corpses (Audio Drama)
- 5: Helsreach (Novel)
- Horus Rising (Novel) by Dan Abnett[Needs Citation]
- False Gods (Novel) by Graham McNeill[Needs Citation]
- Galaxy In Flames (Novel) by Ben Counter[Needs Citation]