Hi, i want to ask if this is a bug or a game feature. The Emperor´s Groth Scroll (30% EXP/SP) buff dissapears after one Instance Boss dies, as example in Nightmare Kamaloka or Kartia. In description its written that this Scroll lasts for one hour.
Probably you used Maphr scroll and as I remember they do not stack. With the Maphr you canceled Emperor as it has stronger effect.