Pathfinder 2 Arcane Sense Feat
You can find Feat Rules here.
Arcane SenseFeat 1
Prerequisites trained in Arcana
Your study of magic allows you to instinctively sense its presence. You can cast 1st-level detect magic at will as an arcane innate spell. If you’re a master in Arcana, the spell is heightened to 3rd level; if you’re legendary, it is heightened to 4th level.
All General Feats
A Home In Every Port | Acrobatic Performer | Additional Lore | Adopted Ancestry | Advanced First Aid | Aerobatics Mastery | Alchemical Crafting | Ancestral Paragon | Arcane Sense | Armor Assist | Armor Proficiency | Armored Stealth | Assurance | Assured Identification | Automatic Knowledge | Bargain Hunter | Battle Cry | Battle Medicine | Battle Planner | Biographical Eye | Bizarre Magic | Bon Mot | Bonded Animal | Breath Control | Canny Acumen | Caravan Leader | Cat Fall | Charming Liar | Cloud Jump | Combat Climber | Concealing Legerdemain | Confabulator | Connections | Consult the Spirits | Continual Recovery | Courtly Graces | Craft Anything | Crafter's Appraisal | Criminal Connections | Deceptive Worship | Diehard | Discreet Inquiry | Distracting Performance | Disturbing Knowledge | Divine Guidance | Doublespeak | Dubious Knowledge | Exhort the Faithful | Expeditious Search | Experienced Professional | Experienced Smuggler | Experienced Tracker | Express Rider | Eye for Numbers | Fascinating Performance | Fast Recovery | Feather Step | Fleet | Foil Senses | Forager | Forensic Acumen | Glad-Hand | Glean Contents | Group Coercion | Group Impression | Hefty Hauler | Hireling Manager | Hobnobber | Impeccable Crafting | Impressive Performance | Improvise Tool | Improvised Repair | Incredible Initiative | Incredible Investiture | Incredible Scout | Influence Nature | Innoculation | Intimidating Glare | Intimidating Prowess | Inventor | Keen Follower | Kip Up | Lasting Coercion | Lead Climber | Legendary Codebreaker | Legendary Guide | Legendary Linguist | Legendary Medic | Legendary Negotiation | Legendary Performer | Legendary Professional | Legendary Sneak | Legendary Survivalist | Legendary Thief | Lengthy Diversion | Lie to Me | Magical Crafting | Magical Shorthand | Multilingual | Natural Medicine | Nimble Crawl | No Cause for Alarm | Oddity Identification | Pick Up the Pace | Pickpocket | Pilgrim's Token | Planar Survival | Powerful Leap | Prescient Consumable | Prescient Planner | Quick Climb | Quick Coercion | Quick Contacts | Quick Disguise | Quick Identification | Quick Jump | Quick Recognition | Quick Repair | Quick Squeeze | Quick Swim | Quick Unlock | Quiet Allies | Rapid Affixture | Rapid Mantel | Read Lips | Recognize Spell | Ride | Risky Surgery | Robust Recovery | Root Magic | Scare to Death | Schooled in Secrets | Seasoned | Shadow Mark | Shameless Request | Shield Block | Sign Language | Skill Training | Skitter | Slippery Secrets | Snare Crafting | Specialty Crafting | Steady Balance | Streetwise | Student of the Canon | Subtle Theft | Supertaster | Survey Wildlife | Swift Sneak | Terrain Expertise | Terrain Stalker | Terrified Retreat | Terrifying Resistance | Thorough Search | Titan Wrestler | Toughness | Train Animal | Trick Magic Item | True Perception | Underground Network | Underwater Marauder | Unified Theory | Unmistakable Lore | Untrained Improvisation | Virtuosic Performer | Wall Jump | Ward Medic | Wary Disarmament | Water Sprint | Weapon Proficiency