Southfringe Sanctum

Southfringe Sanctum is a small cave filled with Spellswords Selveni Nethri can be found stuck in webs in an offshoot from the passage after you kill Bashnag  (if you went right and up in the large chamber). Cut her down and speak to her to begin a miscellaneous quest to help her escape the cave. Her dialogue indicates logical flow is to follow the path to the left instead of the right. Continue on and don't miss the chest as you pass walk down the ramp. Due north of the cave (outside of the dungeon, along the path) is a chest with The Warrior's Charge leaning up against it, a conjuration skillbook.