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

Runeveil Ammunition

ITEM 5
Price 30 gp
Bulk L

Ammunition any

Activate (manipulate)

Pulsing, cracked glyphs scar the surface of runeveil ammunition, seeming to flake and crumble when handled roughly. When activated runeveil ammunition hits a target that can Cast Spells, it's engulfed in a personal cloud of glowing dust. Until the beginning of your next turn, the target takes a –2 status penalty to spell attack rolls and spell DCs.

Effect: Runeveil Ammunition

Pathfinder Impossible MagicORC