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AoS WoC has an entry for Chaos Familiars now.

They have a bland 6+ To Hit and 5+ To Wound and a Bravery 4. but add a stacking 1+ to casting and unbinding rolls for friendly Chaos Wizards within 6".

Are there inventive uses for these guys out there?

A spam unit of charge blockers, diminutive meat shield for missile fire for units and sorcerers?

Essentially that is their use