If you want to do the Spellweaving quest right now, you need to do the "red" version of the quest. ("Red" because muderers cannot do the ilshenar part of the quest even before, Exodus Dungeon cannot be reached)
You can go to tram one Sanctuary too

Starts in Sanctuary, this quest allows you to use/train the spellweaving skill, and does not require you to kill Exodus Minions.
Discipline
Kill 50 rats (in Sanctuary/1 hour timelimit) Spike Traps on the "2nd" lvl 1 shot you, dont step on them. or I'll "lol" =p
Needs of the Many
10 Cotton
Making a Contribution
250 Boards
Supplies for Sanctuary
1 Sack of Flour
10 Jars of Honey
20 Cooked Fish Steaks
The Human Blight (Replaces Exodus Minions/Overseers)
30 Severed Human Ears
Edit: So they added Exodus Minions to a reachable area now eh ?