A Treeman may cast the spell Tree Singing in the same manner as a Bound Spell with a power level of 3. A Treeman Ancient may cast Tree Singing twice in each of his Magic phases.
Source: Warhammer Fantasy: 7th Edition
A Treeman may cast the spell Tree Singing in the same manner as a Bound Spell with a power level of 3. A Treeman Ancient may cast Tree Singing twice in each of his Magic phases.