Devoted to Tsoagoth is a beneficial modifier found in the Necropolis in Path of Exile. It replaces the Haunted modifiers on the Lantern.
Here’s a quick breakdown of what Devoted to Tsoagoth does:
Tsoagoth is the Brine King, a major boss encountered in Act 6 of Path of Exile. It appears that defeating his minions (the Haunted) and gaining favor with Tsoagoth himself (through Devoted modifiers) is rewarded with beneficial effects.
Defeat Rare Monsters with any 7 of the following types of Devoted Modifiers
Devoted Modifier Chance atlas skill: The Lantern of Arimor has 10% increased chance for Devoted Modifiers. Devout Pursuit atlas notable: The Lantern of Arimor has 30% increased chance for Devoted Modifiers.