Cannot be damaged by host, but does not stop host from using effects which would normally damage it.
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Charnas the Imp
Unique demon with 1 life.
Put Charnas on a minion (this is a +1 stealth Ⓓ action if the target minion is controlled by another Methuselah). Charnas inflicts 1 damage on the employer during their unlock phase. Charnas is immune to damage from the employer. If the employer is about to be burned, their controller can put Charnas on another minion.
Rulings
Is not burned if the controller of the vampire it is on is ousted: it is removed from the game.
Immune means damage is not inflicted, even if non-preventable or outside combat.
The option to place the card on another minion can only be used when playing the card normally; for any other action or put into play effect, the card is placed on the playing minion.
The type of the action (equip/employ) does not change regardless of the target.