grizzled pike
The random Sun Charms from the Frostbourne Bell in the final area means that sometimes a Sun Charm can go onto the Frost Junker. If I remember correctly I think I've also seen it on the Lancer, the Muncher, and the Bomber; I've never seen it on the Crusher. I've only ever seen it on the Junker with another charm; it doesn't appear to be one of the available random charms for the boss from the Elite bell.
I think this is too swingy. To some strategies (basically, anything without Snowcake or very fast barrage damage), the Frost Junker on a 1-turn timer is really really dangerous, much much more dangerous than the sun charm going on any other enemy in the fight except for the Crusher; and that randomness in the final fight feels bad. Also, even if it wasn't swingy, and it was guaranteed sun charm on the Junker, I think it might be too hard, and distort strategies too much.
The Sun-Charm-Junker fight is certainly winnable, and winnable even without a perfect deck, but I think the balance of threats without the Sun Charm is really good; I really like that, depending on your deck, the biggest damage threat is often a different enemy in this fight. Making it so that the Junker is the definitively scariest enemy a lot of the time I think makes the fight less interesting and less fun.
I would recommend that the random sun charm be removed from this fight; or at least be restricted so that it cannot spawn on the Junker or Crusher, and maybe also not on the Bomber.
south forge