Reference: Gathering Tiers and Levels (Patreon)

Aether Gathering tier - Low/High Vapor, Low/High Mist, Low/High Haze, Low/High Fog, Low/High Smoke, Beyond Smoke - Can advance to Condensation from High Fog or higher, higher is better for advancing through and beyond Condensation

Aether Condensation tier - Initial, Foundation, Circulation, Threshold, Complete - Can only advance from Completion

Aether Core tier - Seed Core, Foundation Core, Constructed Core, Completed Core, Perfect Core - advancing to Perfect Core requires Tribulation

Soul Strengthening tier – unknown details

Beast Levels and Equivalent Gathering Level

Beasts:

Level 1 - Low Vapor

Level 2 - High Mist

Level 3 - High Smoke

Level 4 - Circulation Condensation

Level 5 - Complete Condensation

Elemental Beasts

Level 6 - Seed Core

Level 7 - Completed Core

Level 8 - Perfect Core

Level 9 - Beyond (More information at higher levels)

Primordial Beasts (examples instead of Gathering Level)

Level 10 - Lightning Monarch

Level 11 - The Kraken

Level 12 - Kyubi-no Kitsune (ruler of central Great Western Forest)