18th Nov: We've switched servers and will be updating the old code over the next couple months, meaning that several things might break. Please report issues here.
Basically, any trope that acts as though X is unbelievably awesome. It can move mountains, or you might be willing to move mountains to get it. It's just that good. Behold the power of X! Not to be confused with index of Power. Not necessarily related to the power of the character named Index in A Certain Magical Index.