Todward wants you to go and get the next piece of the Lucky Charm from Gyerdion which he marks on your map. He also gives you scrolls of Mute and Superior Spell Reflection. Todward would prefer if you could obtain the piece without anyone dying if it can be helped. This is fairly easy to accomplish; the cultists spend a lot of their time in the main hall (which has a lot of Bones on the floor and a Human Heart on the altar; the cultists might not be as harmless as Todward thinks), or asleep. With decent concealment it is possible to sneak past them when they're asleep or worshipping. The Crystal of Flexibility is in a room slightly to the south of the entrance, but is on a lower level, so it is necessary to go through the cultists area.
"This looks like the crystal that Todward is looking for."
You can return straight away, but Ramonicus' Cuirass from the quest Dungeons and Dragons is in the next section of the ruin, Gyerdion Sel Lor, accessed from the main hall if you want to get it now.
Todward gives you 300 Gold and takes the Crystal of Flexibility when you return.
Your next mission is to rescue Ashemanu. Todward gives you scrolls of Summon Skeleton Hero and Immobilize and Strong Potions of Respite, Sorcery and Healing and adds a map marker for Fort Mourngrim.
Near the pier on the mainland opposite Fort Mourngrim is Loretta from the coven. She wants to help out; you can tell her to wait there, send her back, or let her accompany you. NPCs are rarely beneficial in sneaking missions and have a tendency to rush in and get killed on all of them, so sending her back is the best idea.
It is possible to steal the key from the table and rescue Ashemanu without the guards noticing with enough concealment and stealth, or by waiting until the prison is mostly deserted, but it is possible you will need to kill those present in the dungeon.
Once you've rescued Ashemanu leave the dungeon, by the caves if you came that way and still want to stay out of sight, and return to the Order and Todward.
Alternatively, if you choose the option "I really hate mazes" from the Shrine, you will be given the option to skip the full Labyrinth and a shortcut will open allowing you to reach another Mage's Portal to Loc Nor.
The minimap is useless in the labyrinth as it is blacked out. There are a number of containers and items on surfaces inside the labyrinth; taking them either activates traps or summons levelled monsters. You need to make your way through until you find a table with the DeathGrip Key on it. Take this, and levelled monsters appear between you and the exit.
Return to the teleport and go to the western door which the DeathGrip Key will open. In this room in another teleport which takes you to Loc Nor. Loc Nor is inhabited by Daedra; go to the northern room and activate the Block there which will open a wall in the main central chamber that reveals the passage to Sel Loc Nor. Go to Sel Loc Nor. In the main room is Indoril's Bodyguard who carries Alexander's Lost Sword. When taken your log updates.
"So, Alexander's sword was in Deathgrip Keep. Todward was right, he had nothing to do with the brother's death. I do not know if this will convince Alexander of that. Considering what I went through to get this, it is certainly worth a try. I haven't found the Pentagram yet. I can look around a little more, but I have completed my main objective."
"I finally located the Pentagram. Since I already have the sword, my mission is complete. The only thing left to do is get out of here alive."
Now return to Todward who takes the Pentagram and the Sword and gives you 500 Gold. The final quest for the Order of the Candle is Pride and Prejudice where the problem with Alexander is sorted out.