What does assassin mode do on Halo 2?

Question

If you know what any of the other modes do that would be nice also.

Answer 1

All of the skulls, instructions on how to get them, and descriptions of each mode they trigger, are clearly listed in the skull area of the high impact halo website.

Most of the instructions are in text PLUS video. Some of the entries has "action replay" saves, for those who use action replay, in both, NTSC and PAL formats.

The assassin mode makes MOST, if not all enemies invisible (cloaked).