Help Invis Mass Invis Invisiblity

Syntax cast 'invisibility' <character>
       cast 'invisibility' <object>
       cast 'mass invis'

The INVIS spell makes the target character invisible.  Invisible
characters will become visible when they attack. It may also be
cast on an object to render the object invisible.

The MASS INVIS spell makes all characters in the caster's group invisible,
including the caster.