Guild Wars 2

How does ventari’s will work actually? Is it AoE heal each time it pierces an ally?

It will heal an ally that is within the AoE radius of the tablet once when the hitboxes overlap during the traversal. Natural Harmony is an AoE heal for everyone in the radius.

Also cooldown and movement will begin after the cast. (Cooldown is a bit over 2.75 sec)