Historian Seth Minas is a Varrock Museum employee and can be found on the 1st floor[, near the staircase. When you talk to him about the quests you have completed, you earn ]Kudos and fill some of the empty exhibits.
After completion of certain quests, you can go to Minas and give him information about them. He will, in turn for the information, give you Kudos and antique lamps that grant 1,000 experience in any skill above level 20 (antique lamps are acquired after certain amount of kudos has been earned from Minas). Kudos can be used for exp rewards, and allows you to pass freely between the Digsite and Fossil Island to the north once 100 have been earned.
The list of quests needed to be completed are:
- Curse of the Empty Lord
- The Grand Tree
- Hazeel Cult
- In Aid of the Myreque
- Making History
- Merlin's Crystal
- Observatory Quest
- Priest in Peril
- A Tail of Two Cats
- Temple of Ikov
- What Lies Below - bring Dagon'hai history book from the Varrock Castle library or your POH bookcase after completion of the quest
- If you have finished collecting Kudos from Historian Minas, he will tell you to do more quests.