I mean, isn't a single target lily burning 30s cooldown Damage Shield ability a bit lacking compared to the other healers? Why not make it like this instead:
1 Lily: Works exactly as it does now.
2 Lilies: Cooldown is reduced by 10s.
3 Lilies: Cooldown is increased by 10s and has an AoE effect 20y around the target.
Divine Benison will also stack with other Damage Shields.
Edit: Was not aware Divine Benison got reduced cooldown from lily stacks. Could've sworn it didn't before...