Master Thief's Tentacle

Upon use, increases SPD of all allies by 10% for the next battle, and after a victory against an enemy in the overworld, there is a chance to obtain an "extra surprise."

From the most elusive master thief in the history of the Xianzhou. It is said that consuming its tentacle grants the blessings of the master thief.
Don't worry, it has plenty of other tentacles.

"Why would a mere 'master thief' be locked up in a place like The Shackling Prison?"
"Because they're a literal 'heart-stealer.'"

• The Arma Correctional Group