Well, as I've mentionned at some point, I tend to like gore, so no issues there. Though I'm wondering what do you mean by "brutal" now. I'm not exactly picky about bad endings, it's more like I don't like some specific things XD (the specific things being the relationship not working out and simply fading away - so yeah, since you're talking about brutal, I don't think it's that).
I definitely think Xillia II's bad ending is a great inspiration in writing - and well, it is VERY brutal, especially considering you have to play the fight involved in it. If you watch it you'll understand haha!
And you're welcome!