 Nightbane is a dark fantasy role-playing game that uses the same Megaversal system as "Rifts" and a  horror role-playing game implicitly set in what time period?
modern day
Nightbane
Nightbane is a dark fantasy role-playing game and setting created by C. J. Carella and published in 1995 by Palladium Books.
 The game uses Palladium's Megaversal system, which is also used by the multi-genre game "Rifts" and the horror game "Beyond the Supernatural", among others.
Beyond the Supernatural
Beyond the Supernatural is a horror role-playing game published by Palladium Books.
 It has seen two editions released, both of which have introduced innovations on Palladium's standard mechanics.
 A versatile horror-themed game, it lends itself well to wildly different play styles and narrative tones, from schlock splatter-horror to intense psychological horror, with an entire spectrum of terror (or humor, or action, etc.) in between.
 "Beyond the Supernatural" is implicitly set in the modern day, wherein magic and psychic powers are real and monsters and demonic cults exist, but out of the public eye.
 This, however, is not set in stone, and most of the character classes are flexible enough to account for variant settings or time periods.
Forgotten Realms
Forgotten Realms is a campaign setting for the "Dungeons & Dragons" ("D&D") fantasy role-playing game.
 Commonly referred to by players and game designers alike as "The Realms", it was created by game designer Ed Greenwood around 1967 as a setting for his childhood stories.
 Several years later, Greenwood brought the setting to the "D&D" game as a series of magazine articles, and the first Realms game products were released in 1987.
 Role-playing game products have been produced for the setting ever since, as have various licensed products including sword and sorcery novels, role-playing video game adaptations (including the first massively multiplayer online role-playing game to use graphics), and comic books.
 The Forgotten Realms is one of the most popular "D&D" settings, largely due to the success of novels by authors such as R. A. Salvatore and numerous role-playing video games, including "Pool of Radiance" (1988), "Eye of the Beholder" (1991), "Baldur's Gate" (1998), "Icewind Dale" (2000) and "Neverwinter Nights" (2002). Valley of the Pharaohs
The Valley of the Pharaohs is a role-playing game written by Matthew Balent and published by Palladium Books in September 1983.
 Released several years before Palladium established the Megaversal system, uniting all of its game lines under a single ruleset, the mechanics of "Valley of the Pharaohs" differ in many respects from the one currently used in Palladium role-playing games.
 It has been out of print for more than 25 years. Turtles Go Hollywood
Turtles Go Hollywood is a supplement for the "Teenage Mutant Ninja Turtles & Other Strangeness" role-playing game.
 It was published by Palladium Books in 1990 and uses the Palladium Megaversal system. Mutants Down Under
Mutants Down Under is the third supplement to the "After the Bomb" setting of the "Teenage Mutant Ninja Turtles & Other Strangeness" role-playing game.
 It was published by Palladium Books in June 1988 and uses the Palladium Megaversal system. Palladium Fantasy Role-Playing Game
The Palladium Fantasy Role-Playing Game (often shortened to Palladium Fantasy or PFRPG) is a game produced by Palladium Books.
 It is set in the Palladium world (use of the unofficial name "Palladia" is discouraged by the publisher) some 10,000 years after a great war between the elves and dwarves.
 First published in July 1983 as "The Palladium Role-Playing Game", the "Palladium Fantasy Role-Playing Game" saw a second edition in April 1996.
 The two are largely compatible, though the second edition uses a later iteration of Palladium's ruleset to be more compatible with the rest of their Megaverse. Rifts Chaos Earth
Rifts Chaos Earth is a post-apocalyptic role-playing game from Palladium Books.
 It is a spinoff and prequel to their popular game "Rifts", which uses a similar form of Palladium's Megaversal system. Mutants in Avalon
Mutants in Avalon is the fifth supplement for the "After the Bomb" role-playing game, originally based on and compatible with "Teenage Mutant Ninja Turtles & Other Strangeness".
 It was published by Palladium Books in January 1991 and uses the Palladium Megaversal system. Mutants of the Yucatan
Mutants of the Yucatan is the fourth supplement for the "After the Bomb" role-playing game, originally based on and compatible with "Teenage Mutant Ninja Turtles & Other Strangeness".
 It was published by Palladium Books in July 1990 and uses the Palladium Megaversal system.