Upon first speaking to Drevis, he will ask the Dragonborn if they can see him, because as he is a Master at Illusion he subsequently thinks he is invisible. Even though he can be seen at all times, the Dragonborn can still choose to say they don't see him.
As part of a miscellaneous side quest, Drevis asks the Dragonborn to wear Mystic Tuning Gloves and help him cleanse many spots around the college. At each spot, the Dragonborn receives several empty Soul Gems of various qualities or an active effect called Fortify Magicka of +25 or +100 for two hours.
Drevis Neloren delivers a lecture on Doomstones in the Hall of the Elements; most of the members of the College gather around him to listen to his lecture. After he finishes, everyone goes back to their usual schedule.
"The existence of so-called "Doomstones" throughout Skyrim has been repeatedly verified. The meaning of these stones has not. The prevailing opinion of Skyrim natives is that the stones are indeed magical in nature. While there is no direct evidence of this, it does seem likely.
References to similar stones appear in lore throughout the various Tamrielic cultures. None, however, exactly match the markings or distribution of Skyrim's stones. At present, there is no confirmation of any of the various theories surrounding the nature of these stones. Their relative positions do not indicate that any individual stone is part of a larger, unobserved pattern. Also, their placement throughout Skyrim does not correspond to any known magical phenomenon.
The age of the stones themselves has yet to be officially determined. It has been widely assumed that they were placed during the Merethic Era. Writings from that period, including those of Ysgramor himself, do not mention the stones and thus this idea cannot be verified. Nonetheless, many are drawn to these stones based on the local stories describing them as a source of significant power. The College will continue to research these intriguing objects, and of course any findings will be relayed with all possible haste."
This section contains bugs related to Drevis Neloren. Before adding a bug to this list, consider the following:
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PC The gloves used during the purification give unlimited Magicka when equipped.
The buff emitted from the wells after cleansing can grant unlimited magicka for 2 hours. This can be exploited to level very quickly.
Drevis may occasionally spawn on an unreachable ledge on the side of the mountain underneath the college. Sometimes, it is possible to reach him, by descent to the level of the river, crossing over, and climbing up the hill sides on the right side of the college (facing it). Despite the inconvenience, Drevis can still be interacted with as normal.