ns3.mythic-beasts.com has no CNAME records.
Question and response
Question
dig ns3.mythic-beasts.com. NS
Answer
The response has no answer records.
Authority
mythic-beasts.com. 3600 SOA ns2.mythic-beasts.com. admin.beasts.org. 2010171467 21600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0