It was Voltar in Warren Publication's Eerie; I'm certain of it.
"Voltar: Comes the EndtimeVoltar: Comes the Endtime" was printed in English inWarren Publications' The Rook #2 and The Rook #3
The rulers of the goblins show up, Nazgul style. Magog, a black knight, rallies his forces. Voltar goes to the Thorn Forest with a goblin named Minorca. This is the entrance of the Goblin underworld. Terrible vines kill the goblin and capture Voltar. He is rescued by the nether-warlord only to be taken to a cavern. Here a giant snake attacks them. The warlord is injured and Voltar does a good Conan job of killing the serpent. Having killed it, the warlord wants to resume their contest. (In a scene that can only recall the Black Knight scene from Monty Python and the Holy Grail.) Voltar removes his helmet to see that he is plague-ridden, one of the four dooms of earth. Voltar walks away and leaves the warlord to the mate of the serpent he killed.