So you discuss with your guildmaster and he gives you hints.
You find those locations and get the relevant sleek from it (location/mob).
Are those locations/mobs now always where your mage should go to get sleeks?
If so when do those sleeks repop? And are you in competition with other mages who may also have the same location/mob to get theirs?

A little confused about this process and haven't played a mage since Warlock days.