Yesterday, I found some confuse about Melisandre(B74), her ability is "Power on opponents’ characters does not count towards their total power." I know, if my opponent have Melisandre in play, and my house card have 12 power tokens and my character card have 3 power tokens i won't win the game.

But Shae(L178) have an ability "Challenges: Kneel Shae to choose and kneel a character controlled by a player with more power than you." And in this positon, my opponent have Melisandre in play and have 6 power tokens, my house card have 4 power tokens and my character card have 3 power tokens. Can I use Shae kneel his character?

Another question, if character immune to character abilities, for example: Renly Baratheon(B73). when my house card have 12 power tokens andRenly Baratheon card have 3 power tokens, Will I win the game?

Shae is not worded perfectly, but she is usually taken to refer to "total power." So power on cards other than your House card would count toward settling her play restriction, and Mel's ability would need to be included in determining the total power.

The interaction of Mel and immunity has been asked and answered a couple of times. I believe the most detail is in this thread .

ktom said:

Am I understand right?

Opponent side: Mel is in play, and he have total 6 power.

My side: House card have 4 power, character card have 3 power.

Becasue of his Mel in play, so my total power is 4 less than his 6 power. so I can kneel Shae to kneel his character.

Shae says "Challenges: Kneel Shae to choose and kneel a character controlled by a player with more power than you."

If you take "more power" to mean comparing your total power , you must include Mel's ability - which specifically says the power on opponent's characters do not count toward their total power.

So yes, in your scenario, even though you have more power tokens on cards you control, you have a lower total power. As far as the game is concerned, your opponent has more power.