In the second trilogy of Mistborn, The southern tribes could store heat in the medallions. I was reminded about the power of the Firesoul Feruchemists. I was wondering about what the limits of using brass to resist heat is. According to the Coppermind and this WoB it seems that you could wade through fire and be fine. (sorry if this has been discussed before and I didn't see it )
My hypothetical idea is that if someone decided to wade through lava or some other modern method of storing a lot of heat could they be a walking kamikaze bomb by tapping all of that heat at once? It seems like if they had enough heat energy stored then tapping it all at once would probably kill them but they could likely destroy multiple neighborhoods. What limitations are there to filling Metalminds like this?
What about other Metalminds? Besides compounding, which seems like cheating, can you use ways to artificially increase the amount of power that you are storing? For Gasper ferrings could you pump their blood full of too much oxygen with tubes and have them store it?