They are given by an NPC in eldar groove, he is inside the square thingy outside the dojo and i think his name is gildian or something like that.
Some additional info - might be some misstakes in this text as it's been a while since i made em:
For AQ1 you will need 14 caltorsis magis and 15 rotstuffed scarecrows if i remember it correctly.
AQ2 is a bit harder, then you will need 25 giantscale basilisks (solo mobs - level 20), 12 broodtender hatchlings (baby spiders that comes in groups together with their mothers in BB) and the named Advisor Pandrus which roams outside caltorsis ruins and is 22++ or 23++ i think.
AQ3 is challanging, it's inside stormhold and takes a long time to complete unless you got an uber group.
You will need 12 slime thingys, i think almost any living slime will do but i did the condensed mists near the library entrance room. Also, 12 defiled torrents. These roam the halls occationally and seem very rare, but there is a room somewhere dep inside the barracks filled with these. Get there and you'll finish em fast. The final part is 8 guardian writs - flying books that can be found within the library. These are very hard, level 24 and is always in "heroic" battles.
AQ4 is where i gave up, as i never got any help with this one.
Most people say that 5 and 6 is alot easier then 3 and 4 tho, so hang in there :P Anyways, you will need 12 shrillers (bats), 20 scarabs and 12 ire minions from the crypt of betrayal. This isnt so hard, the issue is finding a group to help you out. No one ever hunts in the crypts :P Good luck with that :)
5 and 6 is in TS - many parts of 5 can be soloed i think, and 6 is kinda hard as it involves a named to be slain.
Well, that's all i can remember~ Happy hunting :)
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Narah - 29 Warden/26 weaponsmith on Runnyeye
Amoria - 21 Warlock/12 scholar on Runnyeye