Caliban

X-factor detection: Caliban is able to psionically sense the presence of other mutants within a 25 mile radius of himself. He once proved to be able to detect the presence of mutants far more than 25 miles away when he detected the powerful Moloid mutant Val-Or's psychic scream at the other side of the planet.

Fight or flight response: When stressed, Caliban's adrenaline kicks in, causing him to temporarily manifest two additional powers. These powers subside when his stress level returns to normal.
 * Superhuman strength: Caliban's panic response increases his physical strength, the upper limits of which topped that of Jessica Drew.
 * Fear absorption: Caliban is able to absorb the psionic energy in the fear from others to amplify it back into his environment. This effect can quickly turn nearby people into a panicking mob. Caliban occasionally manifests an enlarged, menacing shadow when his fear power is in effect.

As Death
Hound process: Apocalypse used Celestial technology to augment Caliban's abilities, giving him permanent access to his temporary powers. The transformation increased Caliban's overall height and muscle mass permanently, boosting his strength and physical attributes to much higher than they were before. Shadow power: Caliban was able to use his fear abilities with greater control than before. He could absorb fear energy and turn it against those around him, inducing more intense fear within their minds by directing his "shadow force" at them. His targets would then be paralyzed with fear. Caliban could also convert the fear energy into even greater levels of superhuman strength, making him emotionally-charged as he fed off of people's fears.
 * Superhuman strength
 * Superhuman speed
 * Superhuman stamina
 * Superhuman durability
 * Superhuman reflexes
 * Superhuman agility
 * Superhuman leaping
 * Superhuman climbing ability
 * Claws and fangs

As Pestilence
Psychoactive virus: After becoming Pestilence, Caliban possessed superhuman strength allowing him to lift approximately ten tons. He retains this ability to increase his strength by siphoning fear from others, augmenting it to an, as of yet, untold level.