The player of a dread necromancer character chooses one of the following creatures: imp (devil), quasit (demon), vargouille, or ghostly visage.
Dread necromancers have 4 options to pick as a familiar. Do non-animal familiars give bonuses to master as in typical animal familiar that boosts some skills of the master?
Dread necro handbooks out there confuses me on this topic.
A quote from K's revised necromancer handbook:
You have only one choice at this level: your familiar. There are two good choices: Quasit and Ghostly Visage. The Ghostly Visage is the combat choice, because it makes you immune to mind affecting effects and uses your level as its Hit Dice to generate a save DC for a gaze attack that paralyzes your enemies. Quasit is the less-combat choice because it gives you Commune, unlimited Detect Magic, and can still hand out quite sizeable amounts of Dex damage and its 1/day fear stacks with your fear aura.
for example ghostly visage: Does the master automatically gains immunity to mind affecting effects, or does she have to be possessed by her familiar?
same goes for quasit, does the master gain unlimited detect magic directly or through her familiar, indirectly?