Blood Magic

The episode was viewed by 3.95 million people, earning a 0.7/3 in the 18-49 rating demographics on the Nielson ratings scale, ranking third on its timeslot and ninth for the night in the 18-49 demographics, behind 20/20, Dr. Ken, a rerun of Shark Tank, Dateline NBC, Last Man Standing, MacGyver, Blue Bloods, and Hawaii Five-0.[1] This was a 7% decrease in viewership from the previous episode, which was watched by 4.23 million viewers with a 0.8/3.[2] This means that 0.7 percent of all households with televisions watched the episode, while 3 percent of all households watching television at that time watched it. With DVR factored in, the episode was watched by 5.80 million viewers and had a 1.3 rating in the 18-49 demographics.[3]

"Blood Magic" received positive reviews. Les Chappell from The A.V. Club wrote, "'Blood Magic' is another Grimm episode that towards the end gets to one of the things I've always liked about the show. For all the criticism that can be leveled at Grimm for its scattered approach to narratives and political organizations — are we ever going to mention Black Claw or the royal families again? — it's always been reliable in terms of creating a lived-in wesen community. It's a vibrant ecosystem with a lot of different species trying to exist in a society that doesn't acknowledge them."[4]

Kathleen Wiedel from TV Fanatic, gave a 3.8 star rating out of 5, stating: "One could once again fault the series for introducing new world building with only a precious few episodes left, but Grimm Season 6 Episode 10 made up for it with a definite poignancy to the A-story."[5]

Sara Netzley from EW gave the episode an "A−" rating and wrote, "In your wildest fairy tale fantasies, did you ever expect Grimm to feature a somber rumination on dementia, eldercare, and dying with dignity in its final season? I didn't, but I'm certainly glad it did — and in an episode where seemingly divergent plot threads tidily weave together in the end, to boot."[6]

Christine Horton of Den of Geek wrote, "This week Grimm tackled the weighty subject of dementia and assisted suicide, but of course in a very Grimm-like manner. It was an interesting move, this late into the final season to offer up more insight into the Wesen world and its inhabitants, but it provided a genuinely emotional moment that is rare to experience on a show such as this."[7]