No such thing as "dibs." Camping isn't part of game rules, it's a courtesy players extended to each other to avoid conflicts. I've played in Unrest thousands of times and I think it's a bit much to claim all of "Basement". In fact at suitable levels it's basically impossible to clear the entire basement, including the areas under Garanel. Might as well claim the whole zone!
Notice I said at suitable levels. If your group is being PL'd by a high-level then of course you could probably camp the whole zone, as I mentioned above. But doing that is a discourtesy worse than ignoring camp calls, IMO.
If you want to be sure to get Garanel, then set up your camp THERE and pull to that spot. The best way to ensure "dibs" on a named is, of course, to camp the named's spawn spot.
Edited, Jul 5th 2021 8:35am by Sippin
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Sippin 115 DRU **** Firiona Vie ****Agnarr
FV: 115 WAR ENC CLE MAG WIZ SHD SHM Master Alchemist ROG Master Tinkerer & Poison-Maker
Master Artisan (300+) * Baker * Brewer * Fletcher * Jeweler * Potter * Researcher * Smith * Tailor
Agnarr: 65 DRU ENC SHD MAG CLE ROG WIZ BRD WAR