If a Bone Naga is destroyed does it die permanently?

@ChrisPerkinsDnD Hey Chris, if a Bone Naga is destroyed does it die permanently or does the naga resurrect as it does normally?

— Falren (@Falren207) December 16, 2016

It resurrects as a bone naga. #WOTCstaff https://t.co/sk9vuVVpJZ

— Christopher Perkins (@ChrisPerkinsDnD) December 17, 2016