Thorn is an enemy in Final Fantasy X. It is found in the Cavern of the Stolen Fayth. It casts Fira, and counters physical attacks from party members with Pollen, a Sleep and Darkness-inducing attack. It is weak to Fire, so Lulu's Fire magic is effective against it.
Thorn occasionally drops armor with Sleep Ward and MP +5%. They may also drop weapons with Sleeptouch and Strength/Magic +3% or +5% bonuses.