Needles?! I hate needles!
Qactuar is a fiend in Final Fantasy X. According to a book in the Thunder Plains Travel Agency, the Qactuars once inhabited the Djose continent, but were herded to the Thunder Plains by High Summoner Gandof where he sealed them into stones. The Gandof Thunder Plains were named after him in respect for his achievement.
There are eight Qactuar stones: two in the south section and six in the north. The player can release the seals by pressing while in front of a glowing Qactuar stone. Releasing one seal allows the player to face a single Qactuar in battle. Praying in front of a second stone will allow two Qactuars to appear at once, and praying to a third stone allows three Qactuars to appear in battle. Releasing three seals also summons a Qactuar ghost in the southern section of the plains. Following it will reveal the location of Kimahri's Spirit Lance (his Celestial Weapon).
Qactuars are dangerous enemies to face in battle, they are extremely agile, and physical attacks will often miss, even from characters with a high Accuracy rating. Even when attacks do connect, Qactuars are armored, reducing the damage output of weapons without the Piercing ability. Their extremely high magic defense renders nearly all forms of magic inconsequential.
They have a relatively weak physical attack, but do possess the signature move 1000 Needles, which inflicts exactly 1,000 points of damage. They also have the tendency to run away from battle; if this happens the player will not receive any AP, gil, items or equipment.
The easiest way to defeat Qactuars is to use any physical-based Overdrive, any offensive items (Electro Marbles deal 600 damage, enough to kill a Qactuar in one hit), or a special attack from any aeon.