10 Powers Comic Book Characters Only Used ONCE
6. Storm - Conjure Ball Lightning
In theory, Storm's mutant power seems pretty simple; she can control the weather. However, Storm actually has dozens of powers, many of which she has only displayed one time. In Phoenix Endsong, she explained to the X-Men how she can tell if a storm is natural or created by a mutant. In X-Treme X-Men #2, she showed how she can use electrolysis to create a field of oxygen in her proximity, allowing Storm and those around her to breathe underwater.
Another time, Storm revealed a new ability when she tracked down a punk who had intel on a mutant killer in the area. When he refused to talk, Storm conjured ball lightning and threatened to shove it down the man's throat if he didn't help her. She also said she could pour acid fog into his lungs, poisoning him to death.
Not only has Storm never used these powers again, she has never used them in battle! I know shoving a ball of lightning down someone's neck is a bit extreme but it would end a fight in an instant against some of the X-Men's biggest villains like Sabretooth or Apocalypse.