It was only meant in comparison to the baseline MBP . It is one component more , so it is a disadvantage , even though it might be a small one . There could be manufacturing issues with the TB which might only manifest only after expiration of the warranty , for example . I ' d just like to single out and refute your point about It is one component more , so it is a disadvantage . With that logic , Apple removing the headphone jack was one component less , so it is an advantage . <| sep |> If the party has no knowledge of the amulet you could always rewrite how he was getting the immunity . Some pact perhaps or a weird potion of his own making with one left over somewhere in his lair . Hell , you could even make something up on the grounds of wild magic if it fits . If they do know about the amulet I ' d just tone it down for the players and turn it into resistance instead of immunity . Bullshit logic is the bad guy was somehow empowering the amulet . Super alternatively , and probably the coolest choice , you could just leave it as is but make it evil as can be . Maybe the amulet is sentient and requires souls to function . Maybe it was created gifted by a bigger BBEG or some cursed wizard tower . Perhaps the villain wasn ' t that bad after all and was merely corrupted by this amulet . Lots of ways to have fun with evil corrupted items !