!!!!! I need to ask about that too. Built-in metalminds! Do you think they'd count as piercing the skin, though? Once you Invested them they'd be good, but empty somebody could Push or Pull on them...
When in biology you're talking about scavengers, and you think of mistwraiths. Then you talk about energy transference and you think about how eating chicken before a match is actually not that great of a tradition (though Plate may remedy the issue, I suppose) .
When you realize that if Hemalurgically spiked books were a thing, Stephen King's books would be spiked, and they would steal your SOUL.