This quest is not available in game.
Eliminate Houndmaster Loksey and Arcanist Doan.
We need to eliminate the Scarlet Monastery's defenses before a true invasion can begin. Venture deep into here, their library, and assassinate Houndmaster Loksey and Arcanist Doan. They maintain the powerful defenses that protect their comrades.
My own magic will ensure your actions go undetected by the rest of the monastery. Once they are dead, I can summon in additional reinforcements to aid in our attack.
We must be successful, <name>, the Dark Lady will not tolerate failure in the slightest.