I've heard rumours about Dark Aeons. What are they?
The Dark Aeons are evil versions of the Aeons you get in the game including the secret ones. They are only in the International and PAL versions of the game.After clearing Bevelle, Dark Ixion and Dark Shiva will appear and after you get the Airship the rest will appear. Most of them will block locations and you will have to get past them to proceed. Each of them has extremely high HP and insane stats. They are there to challenge the gamer and test the characters' stats.Dark Valefor is in Besaid Village, Dark Ifrit is in the ruins of Home, Dark Ixion is in the Thunder Plains, Dark Shiva is at Macalania Temple, Dark Bahamut is in Zanarkand, Dark Anima is on Mt Gagazet, Dark Yojimbo is in the sunken cave and the Dark Sisters are in Mushroom Rock Road. Some require certain conditions to be filled before you fight them.
Well Tidus was a dream of the fayth so beating Yu Yevon who made the fayth dream, made the fayth stop dreaming and, since he never really existed, Tidus faded away.
Does Kimahri speak apart from grunting and growling?
Yes he does. He talks for the first time after Operation Mi'ihen but he doesn't say things in battle as the others do although after he starts to talk he will roar occasionally when performing an overdrive.