52 years ago - Jim Rook is born.
33 years ago - 19-year-old Jim becomes the lead singer of the Electrics.
27 years ago - 25-year-old Jim steps into Obivion Inc, an old junk shop, and finds himself transported to the magical land of Myrra where he discovers the Sword of Night and leads the people there in a revolution against their warlock overlords.
18 years ago - 34-year-old Jim returns to Oblivion Inc & opens up a bookstore inside.
15 years ago - 37-year-old Jim participates in the fourth Shadowpact's seance to contain an escaping demon.
11 years ago - 41-year-old Jim breaches the spells isolating Oblivion Inc from it's extra-dimensional anchor, opening the Oblivion Bar, becoming it's owner & operator.
4 years ago - 48-year-old Jim & Zatanna help Blue Devil to venture into hell to complete his bargain with heaven.
There's an amazing pedigree to the idea of Nightmaster, a holdover to a particular era of storytelling. A rock singer that ventures into a magical realm, finds an enchanted sword, and becomes a sword-and-sorcery hero.
The concept is so clean and complete, it actually seems to deplete the idea to try to work the character into modern continuity. Jim Rook is a featured member of the Shadowpact comic, but frankly, it's a little weird for him to continue to wear that outfit once he returns from Myrra. In order to make this make more sense, we've given him a full three years in Myrra for him to have lots of adventures before he returns and truly takes up the role best suited for his later career: proprietor of the Oblivion Bar, the inter-dimensional nexus where magic users find sanctuary. It makes more sense for him to be managing the Bar than to be adventuring with the team. To cement that role, he's been a member of a previous Shadowpact, preventing him from being a part of the current one. It's the same explanation we've used for the exclusion of Constantine & Zatanna, and it allows him to both maintain his new career, and to keep the purity of the original character concept.