Only Vyana exists for tranquility. Tranquillity is eternal Brahma. This is the excellent scat of Udana as the Brahinanas know.
शान्त्यर्थं व्यानमेकं च शान्तिर्ब्रह्म सनातनम्। एतद् रूपमुदानस्य परमं ब्राह्मणा विदुः॥