What's the point of Alu-Fiend having FC: Fighter when it gets WS/EWS as bonus feats?
Rather than that, I wonder what the "Charm immunity" is supposed to be? Does that mean it grants immunity to erinyeses dominations and alike or is this just as useless again as the charm imm on the igwills amulet?
I'm currently levelling up a Killoren Zen and whilst it eventually has two greater Wisdom than a BUR build the lack of free Epic Feats makes it only marginally better than a Sidhe which gets 2 Great Wis at least as far as I have seen so far. As Sidhe is Elf base it also gets always active Search (which is handy as it's likely to be a searcher), four extra Dex (2 from Elf and 2 from subrace) which gives an ac bump and allows a decent chance of avoiding Dex KD checks plus Sleep immunity (saving finding something with this on). As you can only take FE feats before 41 the Great Wis feats with Sidhe allows more flexibility with respect to these and it's annoying to discover your ranger lacks the ability to CS something because of this.