Head type - gp/exp Tzhaar 7.423007246 Demon 8.083760684 Avansi 8.668557536 Abyssal 9.602307692 Dragon. 10.80512821 Dragon Bones 13.33730159 Lava DBones 16.93445378 Dagg Bones 27.84228571 (taken from a google spreadsheet of mine which i can't link b/c of spam protection) (march 9th) This is a few days outdated but should generally speaking be fairly accurate. Although the ensouled heads themselves tend to have a low supply in the ge so you will probably have to buy overnight for the best prices. But overall it seems if you have a decent enough combat level for necromancy, the exp rates tend to be about 350k - 500k per hour in my experience (although this is using the higher end heads). Even still the gp/exp saved is pretty nice 13gp/exp for dragon bones on galtar. And the most expensive gp/exp head being dragon head is still 10 gp/exp and the rest of the heads drop from 9 gp/exp to a measly 3 or 4 gp/exp. Of course not completly accurate as the supply for most of these heads is still fairly low.