Definition:
Apus are the mountain spirits in Andean tradition—powerful guardian beings associated with sacred mountains. 

Nature of Apus:
Each Apu governs a specific mountain and the surrounding territory. These are ancient, powerful, protective spirits who predate human civilization. Apus are not "worshipped" but worked with respectfully as powerful allies. 

Working with Apus:

• Offer coca leaves, alcohol, tobacco.
• Show respect when crossing their territories.
• Ask permission before taking from the land.
• Request protection for travel and ventures.
• Seek wisdom for land-based decisions.

Power Level:
Apus are among the most powerful spirits in Andean cosmology—they hold ancient knowledge and can provide tremendous protection or cause serious problems if disrespected.

Source:
Andean spiritual practice, The Syncretist Realm, TheSyncretistRealm.com.