Dodger's Obscuring Ring

It has 3 charges and regains 1d3 expended
charges daily at dawn. As an action while
wearing the ring, you can expend 1 of its
charges to cast the fog cloud spell from it,
with the following changes: the cloud is
centered on you when it first appears, and
the spell lasts for 1 minute (no concentration
required).
You remember Dodger saying something
about wanting this back...