I've been playing on the Apocolyptic (hard) setting as well. I've not seen an option to reduce the difficulty anywhere. It's been challenging but in a satisfying way. I've died alot but the auto save function is really good so after a few tries I have been able to get by everything. About five hours in, past Tiamat and the big scottish guy Ulthane. Just heading into the second "dungeon".
I'm almost done with that game playing on Apocalyptic. It keeps you on your toes, I've died 66 times so far, many of those falls. Once you learn how to beat each boss they are all push overs, like any game.