There is one story purpose for infernal iron the only other thing it can be used for is when dammon crafts some into some nice armor for you. Since enriched infernal iron cant be crafted into anything the only other reason for its existence would lead you to believe that it's for karlach. The only other reason for infernal iron even being in the game is to cool down the engine. If you're going to over look the literal one reason for infernal iron to be in the game then im not gonna bother responding since you aren't trying to look at this from any other perspective than your own.
