Jose Antonio Sanchez  was in charge of  some of the make-up work, like the witch Conan finds in his search for Thulsa Doom.

The exterior of the witch scene was shot at Cuenca, Spain;  they used the same rocky landscape that was filmed for "Valley of Gwangi".

J.A. Sanchez  giving last touches to John Millius make-up.

 

He was also responsible apliying  some make-up character and masks for the semi neanderthal and orc looking characters that appeared at the interior of Thulsa Doom's cave. The characters were  sculpted by Carlo de Marchis.

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Jose Antonio Sanchez painting some symbolic and mystics signs on Conan´s false head,  for the scene when the demons come at night to get Conan´s body.

The FX team make a support to suspend  Arnold´s body in the air,  and make him move as if demons were pulling him.
After some rehearsal, the effect  achieved was not the desired,  and Arnold complained abut the uncomfortable of it.
J.A. Sanchez  made a false Arnold body ,and took a cast of his head. The  lighter false body with a painted head moved pretty successfully, to latter insert the animation of the flying demons.

John Millius with the head of Conan´s father at Guadarrama mountains,  near Madrid.

 
 

The vulture that bites Conan at the cruxificion scene,  was an animatronic made by italian technician Carlo de Marchis

For the combat scenes,  the Spanish FX technicians Antonio Parra and Antonio Balandin worked under Nick Allder providing some exploding  small blood bags. Parra and Balandin had worked with Allder in more that a dozen films during the seventies,  when  British crew came to Spain very often.

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For the decapitation of Thulsa Doom,  they used a false head with also exploding blood.

 

Carlo de Marchis was in charge of the the transformation of Thulsa Doom to a snake.
He made a false James Earl Jones head and insert some mechanical movement to distort the skin

 

For the final stage they used a mechanical snake head on Doom´s costumes, also made by Carlo de Marchis.

For the scene when  Doom-snake escapes from the room through a hole, they used a real snake, but they couldn´t get any specimen of the proper huge size, so they used a regular one,  and Emilio Ruiz built a replica of the room in miniature, to make the real snake match the size of the mechanical snake head.