pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Guiding Starknife

ITEM 7
Price 325 gp
Usage held in 1 hand
Bulk L
Category martial
Group knife
Damage 1d4 piercing

This +1 striking returning starknife is made of dark blue metal overlaid with smoky flecks of fused quartz. When you Cast a Spell and deal damage, your next attack before the end of your turn with this starknife ignores standard and lesser cover.

Activate—Points of Light (concentrate, spirit)
Frequency once per 10 minutes
Trigger You successfully Strike a creature with a thrown Strike with the guiding starknife

Effect The guiding starknife's blades detach, form into darts of starlight, and deal 4 piercing plus 1d4 spirit damage to the creature you just hit. This damage increases to 6 piercing plus 1d4 spirit with a greater striking rune and to 8 piercing plus 1d4 spirit with a major striking rune. The guiding starknife then re-forms and returns to your hand. Until the start of your next turn, the damaged creature is outlined with soft light and can't gain the effects of concealment.
Pathfinder Impossible MagicORC