Just picked up Jack of Thorns by AK Faulkner bc god I saw the description and it looks so very interesting and the ebook is currently free on all storefronts (info from their twitter) And the desc from their tumblr I also saw in the replies of a tweet that made me grab it

"Two guys with uncontrolled powers (one doesn't even know he has them) face off against a dying Celtic god who wants something they can't (won't) give him. If they're going to survive saying no to a god, they'll have to work together to master their gifts before it's too late."