Panthera is a Void affinity rare from the Skinwalker faction. Panthera was added to Raid Shadow Legends during the festive fusion in December 2020 as part of the legendary fusion for the High Elves champion Pyxniel.
Panthera requires a HUGE amount of books that does not represent her value in content for Raid. She can bring some Fire Knight utility with multi hit A1 and A2 and some turn meter decrease however is overshadowed by lots of other rares.
Overall I would not advise you to invest in this champion.