As noted in the title, the socketed gem Elusive Blasphemite provides a runspeed boost that does not properly stack with the on-use Death Knight ability Death’s Advance.
Testing methodology:
I used the following macro to gauge player runspeed: /run print((GetUnitSpeed(“target”)/0.07)…“%”)
Death’s Advance speed bonus: +35%
“Speed” tertiary stat on gear: 7.31%
Total boosted speed without Elusive Blasphemite: 142.31%
Elusive Blasphemite speed bonus with current gems: 6%
Expected boosted movement speed: 148.31%
Total boosted speed with Elusive Blasphemite: 142.31%
Other players’ testing has diagnosed other movement abilities which do not properly stack with the gem, and has possibly pinpointed the cause of the bug: