[11] It received positive reviews from critics with praise for the cast performances, cinematography, music and production design.

He is brought before the lord of the mana, Kodumon Potti, who asks his whereabouts and upon learning he is a paanan (folk singer), requests him to sing for him.

The only way that the cook and Thevan could escape the manor is by defeating the chathan by extinguishing an ever-burning lamp located in a secret chamber in the granary, and then trapping it in a special chest.

The cook, now revealed to be Potti's illicit son, grabs the ring and sets the chathan on fire, causing the creature inside to emerge.

A platoon of Portuguese soldiers emerge from the forest, cross the river, and march towards the mana's direction, while the chathan in Thevan's body is seen leaving the area, wearing the ring.

Chakravarthy Ramachandra launched a production house exclusively for horror films, Night Shift Studios, debuting with Bramayugam.

[17][18] Shehnad Jalal was announced as the cinematographer and Christo Xavier as the music director, while Jothish Shankar worked on the film as a production designer.

[20] Cast members announced during the film's launch included Arjun Ashokan, Sidharth Bharathan and Amalda Liz.

[22] In September 2023, Makers revealed a special first look poster of Mammootty on his birthday and as per reports he will be playing a character who practices black magic in the film.

Akshay P R of DT Next rated 4 out of 5 and wrote, "Director Rahul Sadasivan is yet again exploring the haunted mansion theme but is quite different from his previous film 'Bhoothakalam' as it was more of dealing with our own past, but Bramayugam (The Age of Madness) is more of a black and white film, in the horror-thriller genre to explore the power pattern in history.

"[35] Nikhil Sebastian of Pinkvilla rated 4 out of 5 and verdicted, "Bramayugam stands out as a cinematic gem that transcends the typical horror genre.

[36] Sanjith Sidhardhan of OTTplay rated 3.5 out of 5 and reviewed, "Mammootty’s Bramayugam benefits richly from its engaging screenplay, cinematography and performances, which makes the viewer forget that it’s a black-and-white film and lets you enjoy the magic of cinema.

"[37] Reviewing for The News Minute, Sukanya Shaji stated, "The heart of this monochrome horror thriller is, of course, Mammootty.

"[38] The New Indian Express' Vignesh Madhu rated 3.5/5 and reviewed, "While Bhoothakaalam saw Rahul expertly handling psychology and supernatural elements, he blends folklore and horror in Bramayugam to create a terrifying atmosphere where almost every moment is an event.

Instead, it's the intricate world-building orchestrated by Sadasivan, with significant support from Ramakrishnan, within a confined yet evocative setting, that truly captivated this reviewer.

[41] Janani K of India Today rated the film 3/5 and said, "‘Bramayugam’, with an intriguing story, gifts you an immersive experience.

[42] Deccan Herald's Arun Antony rated 4/5 and reviewed, "Arjun Ashokan surprises as the paanan but Siddharth Bharathan stands out as the cook.

"[45] Analysing the film for Onmanorama, Sajesh Mohan wrote about the power politics depicted in the movie, "Rahul's 'Bramayugam' and Jijo's 'My Dear Kuttichathan' depict the manipulation tactics of power-hungry people who ensnare gods and demigods like Chathan, Karinkali, Yakshi, etc., exploiting their vulnerabilities to instil fear and exert control over fellow beings.