Chant of Resonance

Chant of Resonance is a Monk passive skill, unlocked at level 20.

In-game
The Inna's Mantra set bonus for having 4 pieces does not count as having a Mantra skill for the purposes of this passive skill.

All four Mantras are affected: Mantra of Salvation, Mantra of Healing, Mantra of Retribution and even Mantra of Conviction.