From Pathfinder Lost Omens Tian Xia Character Guide, which isn't enabled.

Flashblade (Major)

ITEM 17

BRACE DEADLY-D12 MAGICAL REACH

Price 14700 gp

Usage held in 2 hands

Bulk 2

Category advanced

Group sword

Damage 1d8 slashing

A sleek and impossibly lightweight blade attached to a haft scriven with lightning bolts make up this +3 greater striking nodachi.

Activate—Prepare Flash (concentrate)

Frequency once per 10 minutes

Effect You concentrate with complete focus on your surroundings, breathing in the flashblade's magic to make you lighter and faster, and the blade of your sword more flexible. You Ready a melee Strike, increasing the flashblade's reach for that Strike to 25 feet. If the trigger doesn't occur, this doesn't count against the flashblade's frequency.

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