Caliban has been genetically augmented by Apocalypse, twice, on two separate occasions. The first time as Death, in which he was given Superhuman Physical Conditioning plus clawed fingernails and a twist to his fear amplifying powers. As pestilence he was given a neurotoxic mental plague, which apparently faded.

X-Factor Detection: He is able to psionically sense the presence of other mutants within a 25 mile radius of himself. He once proved to be able to catch mutants presence far more away that those 25 miles when he detected the powerful Moloid mutant Val-Or's psychic scream, at the other side of the planet (This mutant was powerful but his powers could only have been sensed by more sensitive people).
Fear Absorption: He is able to absorb the psionic energy in the fear from others and convert it into physical strength.
Superhuman Strength: Caliban can use fear that he's absorbed to enhance his physical strength, upper limits of which tops that of Jessica Drew, Spider woman.

Base figure DC Universe Abin Sur
Fodder jacket
Apoxie work and finally full repaint