pf2e.fyi
From Pathfinder Advanced Player's Guide, which isn't enabled.

Shadow Illusion

FEAT 12
Archetype Shadowdancer
Prerequisites Shadow Magic

With an artful eye, you shape shadows into illusory forms. You gain the Shadow Illusion focus spell. Increase the number of Focus Points in your pool by 1. You become an expert in occult spell attack rolls and DCs.

Pathfinder Advanced Player's GuideOGL