So 10 8's is mythic. That's only 2^40 (probably less since the 8's dont have to be in a specific position in the hash). Based on https://gist.github.com/epixoip/a83d38f412b4737e99bbef804a27... you should be able to bruteforce a mythic amulet in 48 seconds with a high end gpu from 2016.
Doesn't sound that mythic to me.