The Umar Hills boy is a Bug. Don't know but it might be fixed with the latest patch.
About the Hold...
Spoiler
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If you decides to help Nalia and accept it as your Hold, you will recive the quest "Running D'arnese hold" or something like that..
This quest will stop in time.. Wait and se what happens.
The ticket to exp is just to do every quest you can find, there are also tricks like summoning hostile enemies, like pitfiend etc.
You will recive exp when killing there in diffrence from the normal monstersummoning etc.
Suldanessellar location will appear after doing sertain things in the end in the main quests..
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