There is some great - not just good, but genuinely great - gore effects in Darkness Rising. But it sucks. It sucks a lot, and as much as I've got an affection for Katrina Law after spending so much time with her in Spartacus and Arrow, she is not a great actress, not in general and not in this, and she's still the best actor of the bunch. There might have been a solid idea here once, and there's obviously some talented people working somewhere behind the scenes, but even if you're a diehard horror fan, you can skip Darkness Rising altogether.
Final rating:★★ - Had some things that appeal to me, but a poor finished product.