Volley do not work when gtaoe target is placed higher than 200 units from caster, happen in keep not in open field.
No ceiling present.

Friar goet Static Tempest from RA.
One of the strongest active RA

It is a Hibrid class so there are more choice.
Can be even a main healer if full reju, it lack insta heal but in certain occasions can be more durable than a cleric especially if a cleric take the way to get the group cure for disease and poison/ns.

The proc that heal while hitting is often ...