Currently the Eternal Gem is not on the drop table for superior slayer monsters. I think adding this to the drop table will give players another item to look forward to obtaining while doing slayer. Now I know having the gem on Alora is impractical because we can just look at our Game panel and see what or how many monsters we have left to slay.
My suggestion is to add it to the superior drop table as an item to sell to the Slayer Master similar to ensouled heads.
I think if we add it at a 1/1000 drop rate (0.1%) and allow players to sell it for 10M this would entice players to kill Superior creatures as well as have something to look forward to while doing so. I believe if the item isn't trade able and has a broadcast message it would be a nice add to the server. Thank you.