Forgotten Realms Unearthed Arcana! (MD 227)

4399.85 - 4430.861 Sean Merwin

The second third-level thing makes sense to do that. Level six feature is Blessing of the Moon Wells. You always have the Moonbeam spell prepared. And then as a bonus action, you can cast Moonbeam without expending a spell slot. You can only do that once per long rest. So you can always cast it. But casting it in this way as a bonus action without expending a spell slot gives it a special feature.