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Sensor in FFX is an ability that can be customized onto a weapon. When a character equipped with Sensor is on the battlefield, you will see additional information on your enemies in your battle UI.
Note: A weapon’s name may change after customizing it with Sensor. The customize feature will be unlocked when you reach Guadosalam, shortly after Rikku joins your party permanently.
Where To Get Ability Spheres
Wakka Using Extract Ability
Like most other spheres used on the Sphere Grid, ability spheres are dropped by enemies after defeating them.
Here’s a list of fiends that drop ability spheres naturally after a battle:
Enemy Name
Location
Piranha
Submerged Ruins, Besaid (Underwater)
Dual Horn
Mi’ihen Highroad, Home
Basilisk
Djose Highroad
Larvae
Thunder Plains
Xiphos
Macalania Woods
Chimera
Macalania Woods, Home
Sand Worm
Bikanel Island
Guado Guardian
Home
Warrior Monk
Bevelle
Maze Larvae
Via Purifico
Chimera Brain
Calm Lands
Epaaj
Calm Lands
Valaha
Cavern of the Stolen Fayth
Grendel
Mt. Gagazet
Fallen Monk
Zanarkand
Additionally, other fiends can drop ability spheres through the use of ability distillers, the Extract Ability skill, and by using weapons with the Distill Ability trait.
How To Use Sensor
Elemental Damage Overkill
Some of the information provided by Sensor can be utilized in obvious ways. For example, seeing the enemy’s HP can give you an idea of how long the battle will last.
Seeing a target’s resistances and weaknesses will also tell you how to take advantage of certain attacks and spells. However, there are other ways to use the information from Sensor.
Let’s go back to the example of seeing a fiend’s current HP.
If you notice that the fiend starting to get low on HP, you can prepare to use attacks it’s weak to for a better chance at getting an Overkill. This can help you plan overkills specifically to get extra drops.
Tip: When an enemy’s ability is mentioned in the Sensor UI & when the enemy’s ability is highlighted in blue text, that usually means Kimahri can learn that ability with Lancet.
And for one more obvious benefit, Sensor can also be more direct by straight-up telling you to inflict certain statuses on the enemy to avoid some of its attacks. So it’s definitely one of the better weapon abilities – and especially in the early game it’s worth getting as soon as possible.
