In continuing the theme of dark side planets, Malachor is yet another mysterious world that could could be a major location and could hold information about the force, the dark side and the Sith.
Malachor was a planet briefly introduced in the season three finale of Star Wars Rebels. Its appearance in the show featured one of the most climactic moments of the series as Kanan, Ezra and Ashoka faced off against Inquisitors, Darth Maul and even Darth Vader himself.
According to Kanan Jarrus, the planet served as an ancient battleground between the Jedi and Sith, with antique light sabers scattered all over the ruins that the pair are exploring.
Oh, and the planet just happens to have a super weapon that resembles some sort of temple. Discovering the origins of this super weapon could make for an interesting comic or setting in future video games (perhaps in a sequel to Jedi Fallen Order II).