Grand Magus appears in the Adamah Block of Tartarus, from floors 229 to 235. In this block, it will also be accompanied by a Vehement Idol. These Shadows will also appear in the Monad Depths in groups and will be mixed with other Shadow types from the 6th floor onward.
In Golden, Grand Magus is neutral to physical attacks and elemental spells, but is immune to light. In battle, it attacks with low level AOE versions of all elemental spells. It will also use Mind Charge to amplify its Megidola.