Ring of Wild Shape (5e Equipment)
From D&D Wiki
Ring, rare (requires attunement by a druid)
A wooden ring made of three braided strands. Upon closer inspection, you can see that each strand has a different animal carved into it: A bear, an eagle, and a serpent.
Enhanced Shaping. A 2nd level or higher Druid equipped with this ring increases the max CR of creatures they can Wild Shape into by 1.
Frequent Shaping. A 5th level or higher Druid equipped with this ring increases the number of times they can Wild Shape per day by 1.