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To those who are laughing it up about Final Fantasy X-2 selling more than XIII in it's their first weeks forget that consoles are in decline in Japan and handhelds are now all the rage. The PS3 had a very rough start and is only now catching up.
Oh, and would people still stop calling XIII "bad" as if it is a fact? Especially when talking about something objective like sales number. When asked for your opinion it makes sense to say it is "bad" if you really thought so but XIII is not universally panned by critics or players. So stuff it. It is not objectively a "bad" game and has nothing to do with XIII's first week sales. 
As for XIII-2's sales, it is a spin-off so it is not surprising. There are also a small, but substantial enough group that didn't buy it because they didn't like XIII. I also read an article that said the it was the decrease in female buyers that largely affected sales. This actually does make sense as I have noticed that many women are drawn to the character Lightning. Yes, Lightning is in XIII-2 but she is only a temporary playable character and has also had a makeover which may have deterred those female consumers. That's just speculation though.
Either way, XIII-2 is still enjoying great sales... The game had a considerably shorter development time and probably did not cost near as much as XIII to make. It's acceptable that it's sales are lower.
I'm surprised at how well X-2 sold... I know I didn't buy it.
Lamia's Tiara- Headgear in FFIX
Lamia's Flute- Weapon for Eiko in FFIX
Lamia in FFV- a enemy
appearance: a lady with long brown hair, wearing a tiara...half woman and half snake.
Lamia in FF3j- A Harp
Lamia in FFL2- An enemy
FF2j Queen Lamia, at one point she even gets Frionel in a bedroom with her and jumps on the bed and says "take me!".. before she turns into her snakey self. She serves as a mini boss in this game (as Queen Lamia).. and after you fight her as a mini boss, regular lamia's become random foes and later on in the game, Queen Lamia's become random foes as well.
LamiaScl. an item that paralyzes foes.
According to legend, she was once a Libyan queen (or princess) who fell in love with Zeus. Zeus' jealous wife Hera deformed her into a monster and murdered their offspring. She also made Lamia unable to close her eyes, so that she couldn't find any rest from the obsessing image of her dead children. When Zeus saw what had be done to Lamia, he felt pity for her and gave his former lover a gift: she could remove her eyes, and then put them on again. This way, though sleepless, she could rest from her misfortune. Lamia envied other the other mothers and took her vengeance by stealing their children and devouring them.