Mortimer

Mortimer was the leader of the cultists. The cultists saw him as a prophet and they also worshipped him. It seems as if he was somehow able to control the ion storms in some way - at one point causing the lightning strikes at 3 equidistant points from him. Whether he had actual power or this was just a trick is unknown, but he did seem to be able to keep Tiberium wildlife from harming the cultists. Eventually, he was shot by Ghostalker, at which point most of the Cult Guards killed themselves. He himself had very little combat effectiveness. Exactly who he was and why he had started this cult is unknown.