Its always best to keep someone at higher level to kill aggro. There are alot of goblins running around and will need someone get off kiters, as for undead goes at night, we never had any spawn close to outpost.
In this garrison we used multiple kiters because it isnt easy to pull them. All mages will need echodrops because ants will use there AOE silence. You have 30 mins to complete it, and as always drops depends on how many NPCs live. Trigger is dhelmel leather massive from ants in quicksand caves.
Drops not listed:
Memories
Manniquien Legs
Manniquien Feet
Refresh Earring