His power states.

MY NIGHTMARE - OR YOURS?: If an opponent wins the roll to determine the first player and does not choose Nightmare's controller to be the first player, characters on that opponent's force modify their attack value by -1 as long as Nightmare is on the map.

My question is, Do I have to tell my oppontent about the power before he or she chooses if they want to go first if they win the roll? Or must they be aware of their power on their own, meaning I do not have to tell them until they make a choice.

I should think you should have to tell them, because they may not be aware of the trait, but since it doesn't say you have too, I guess it is up to you.

To not make them aware is unsportmanslike.

Technically, they should ask about your character's traits and sp before the match begins. But it maybe idea for you to let them know about it, that way it will prevent fights.

But not in any way illegal.

I would say you are not obligated to warn them of the consequences of their choice. I would imagine that in many venues and most home games it would be frowned on to do the "Aha! Gotcha!" thing, but the rules don't prohibit it in my opinion.

join the discussion that is all ready going on.
http://www.hcrealms.com/forum/showthread.php?t=410305

Ah, thanks. I quit subscribing to that before the orange post.