Then there is a fourth form, Opapatika, which goes against Buddhist beliefs because it involves suicide: a class of supernatural beings who are born out of suicide. However, the powers that they gain also have a negative effect.
The narrator, it is revealed, is Thuwachit (Pongpat Wachirabanjong), the loyal mortal henchman for the elderly Sadok (Nirut Sirichanya), an Opapatika who is quickly decaying and needs to feast on the flesh of other Opapatikas in order to sustain himself. He sends Thuwachit out to capture others.
Four Opapatikas remain:
Investigating the Opapatikas is a private detective, Techit (Leo Putt), whom Sadok transforms into an Opapatika. Techit has the psychic powers of a mind reader, but his power costs him the use of his five senses.
Techit is teamed up with Thuwachit, who leads a vast paramilitary army against the four Opapatika. The four immortals are also mysteriously drawn to a woman, Pran (Khemupsorn Sirisukha).
Bangkok Post film critic Kong Rithdee characterised the film as dull and overly violent, summed up as "an ambitious film that ends up merely an exercise, and not a very memorable one at that."
The Nation was more upbeat, saying the film had a strong ensemble cast and compelling story, but was undermined by poorly framed action and inadequate lighting. "If it hadn't been so dour and serious all the time, and had better presented action sequences, Opapatika could have been a contender," the newspaper's reviewer said.
The film review blog Asian Cinema - While on the Road was harsher, calling Opapatika "loud, pointless and witless ... this has a body count that could fill a football stadium ... but not one of these myriad of corpses would evince even a slight care from you – just fodder for the threshing machine of CGI death."