Brogmim was crushed to death a mere hour after being summoned to the Material Plane via Edward's Fiend-touched Pearl of Power. The Earth Stone Elemental crushed the Imp leaving no trace of a body.
Brogmim was summoned again during ventures into The Frozen Isle, he was of little help, only providing passing knowledge of undead and rituals. He transformed into a spider and concealed himself in Edward's clothing. He was no where to be found after the adventure to the iceberg, likely killed by the acid bile of the Mother of Worms that coated Edward.
Brogmim makes his third appearance when summoned from the Underworlds through a portal of the Black Wax Candles. These fiendish candles have grown stronger since their first use by Edward.