Contagion Transfer is used by the cockatrices in the Moa Constrictors KSNM - It swaps the target's buffs with the user's debuffs. So, let's say you're Gravitied and the mob casts Stoneskin, you use the shield - now you have Stoneskin and the mob is gravitied.
Hey Starfire, still have that shield? Can I buy it off ya? <.<