Unknownreported this bug
Main Issue: I was doing a skill that checks if the player was holding a custom item I called Apple Pizza. Note that this custom item used a custom player head for it's texture. However, my players were able to use any player head item regardless of whether it was Apple Pizza or not for the skill to work. I would appreciate a fix on this. :)
Update: Turns out Mythicmobs can't distinguish between item materials. Also probably an issue.