These guys are some bastards, the hardest mini-boss IMO. Still, with enough maneuvering it's manageable so long as they don't both use the same screen-covering attack at the same time. Spells can be useful, but melee is just fine too. Full details at: /?id=213943327#209529
Note: This video was recorded on New Game Plus 2 with one Grace Rune to reduce difficulty somewhat. Still, the principles used in this fight remain the same regardless of your level and progress through the game. I ended up using my Hyperion Ring in this fight, but that's because I came into this tough fight with low health. I could have used mist form because I was an Assassin, but I didn't think to use it in time and thought I could just dodge that ice shard.
At present, IGIPNP has 11,185 views spread across 9 videos for Rogue Legacy, and less than an hour worth of Rogue Legacy videos were uploaded to his channel. This is less than 0.35% of the total video content that IGIPNP has uploaded to YouTube.