Just that 'Hide in plain sight' is both an Epic use of a skill and a PrC class ability. A regular rogue (or other PrC) can't do this at all till they are 21st. level.
Epic characters and Shadowdancers can do this, but at a -20 DC to their hide skill check.
Hide is a move equiv. action, the class ability of the shadow dancer is to allow them to hide in plain sight, using the hide mechanic... therefore, hide in plain sight is also a move equiv. action.
The Class ability of the shadowdancer is allowing a character to accomplish something before they are epic.
Epic characters and Shadowdancers can do this, but at a -20 DC to their hide skill check.
Hide is a move equiv. action, the class ability of the shadow dancer is to allow them to hide in plain sight, using the hide mechanic... therefore, hide in plain sight is also a move equiv. action.
The Class ability of the shadowdancer is allowing a character to accomplish something before they are epic.