Band of bestial form

An item to be used by a druid. From a distance it looks like an ordinary wooden ring, but close up, there is a small carving of an owlbear. The ring allows the wearer to transform into an owlbear and one other non-beast of their choice, limited to their current max CR+1.

If the chosen non-beast is much bigger than an owlbear, casting wild shape burns both slots, up until level 20.

Notes: Must cast wildshape at least three times whilst wearing the ring, Shapechanging, Jewelry, enchantment