TheWoWDBI was able to solo this with very minimal support, as a 70 shadow priest. There was a friendly tauren druid who would cast moonfire or starfire on Naberius, but that was towards the end of the fight.
Here is a synopsis of the strategy I used:
Naberius: "Grr, I'm going to cast frostbolt on you"
Player: "I'm going to duck around the corner."
Naberius: "Gosh I can't see you anymore. Let me run after you."
Player: "I came back out from the corner!"
Naberius: "Grr, let me cast frostbolt on you again."Here is the strategy I used in more detail:
Clear the area surrounding the church of any ghosts. Then clear the inside of the chapel of the two stationary ghosts. Like people have mentioned in previous comments, Naberius will use frostbot as a primary attack. He needs a few seconds to cast this, of course. So what you do, is mindflay or renew any dots you want to use while he is casting, then quickly move out of line of sight from the frostbolt. This will cause him to stop casting, and move after you. Once he does this, move back out into his line of sight. He will again try to frostbolt you. Mindflay, or wand, whichever you prefer. Then before he finishes casting, move out again.
I used the chapel as a means to escape line of sight from Naberius by moving around corners just as he was finishing frostbolt.
Oh, and if you see the red diagram under your feet, move out of the way.
You could probably solo this as a lower level shadow priest. The strength is in the strategy and execution.
Quest
Destroy Naberius!
A World of Warcraft quest in Netherstorm. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
You can find him in a church at (63,79). This quest is actually very soloable. Inside his room are two Tortued Spirits which can be pulled independently from Naberius. Naberius casts Frostbolt so it's very easy to LoS him. Don't get too close to the edge because he does a knockback. Lastly, stay out of the red portals he summons.
fyi, he is immune to silence
Quest facts
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(10320))
What to do
Kirin Tor Apprentice's Robes, 
Lifewarden's Breastplate, 
Coif of the Wicked, 10g 50s, 5,150 XPDescription
Archmage Vargoth saw the danger in Naberius's pursuit of necromancy, but I don't think he ever anticipated that his own apprentice would wreak this much destruction upon the Kirin Tor. You must defeat him, {name}, or else he will continue enslaving the spirits of our fallen brothers, robbing them of their rightful rest and destroying what little remains of Kirin'Var. With his phylactery in hand, he can be confronted by two or three combatants, but who knows what his magic might do to more foes?
Where to go
Pins are the quest’s own POI points from the current retail client, projected onto the in-game zone map. The game marks one blob as the quest’s turn-in; the rest are objective areas. Points that fall outside a map’s window are dropped rather than guessed at.
Turn-inObjective areaIn-game waypoint: /way #109 57.5 86.3
Coordinates
- Turn-inNetherstorm 57.5, 86.3
/way #109 57.5 86.3 - Objective areaNetherstorm 62.7, 78.8
/way #109 62.7 78.8
Map coordinates of the pins above. An area the client draws as a shape is given by the centre of its points.
Nearby on the Netherstorm map
- Desecrate this Fire! about 1,560 yards
- Honor the Flame about 1,570 yards
- Warchief's Command: Netherstorm! about 1,590 yards
- Hero's Call: Netherstorm! about 1,590 yards
- Nexus-King Salhadaar about 1,770 yards
Quests whose map markers the client places closest to this one on Netherstorm, nearest first. Distances are straight lines between the markers.
Getting there
Flight points closest to the quest’s turn-in marker on Netherstorm:
- Cosmowrench, Netherstorm
- Area 52, Netherstorm
- The Stormspire, Netherstorm
From the turn-in, the objective areas lie:
- Objective area
Straight-line distances in yards between the quest’s own map markers (QuestPOI) and the client’s flight-point positions (TaxiNodes); flight paths and terrain are not modelled.
Community notes from Wowhead · 159 comments
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Choose one of these rewards:
- Kirin Tor Apprentice's Robes
- Lifewarden's Breastplate
- Coif of the Wicked
Legguards of the Resolute Defender
Reward details
Pick one of these
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.
Storyline
Netherstorm
Part 67 of 103.
Previous: Capturing the Phylactery · Next: Curse of the Violet Tower
- 62Malevolent Remnants
- 63The Annals of Kirin'Var
- 64Searching for Evidence
- 65A Lingering Suspicion
- 66Capturing the Phylactery
- 67Destroy Naberius!
- 68Curse of the Violet Tower
- 69The Sigil of Krasus
- 70The Sunfury Garrison
- 71Down With Daellis
- 72A Fate Worse Than Death
- 73The Unending Invasion
Showing steps 62 to 73 of 103.
Storyline order is the client’s own QuestLine data from the current retail build.
Where this quest fits
Before this quest
Taken from the storyline's own step order.
- Capturing the Phylactery
I suppose an explanation is in order. You've met one of the archmage's apprentices, Ravandwyr, but there was also another named Naberius. He was an ardent student, but was drawn to necromancy.
After this quest
Taken from the storyline's own step order.
- Curse of the Violet Tower
Now, you will be able to use the archmage's staff to contact him. He resides in the Violet Tower, on an 'island' to the southeast. The tower is both sanctuary and prison to him, cursed as it is. Kirin Tor can neither enter nor leave, keeping me apart from my master.
Also counted by Into the Nether
Its criteria name 14 quests; others include:
- Dr. Boom!
- Down With Daellis
- Torching Sunfury Hold
- Building a Perimeter
- Back to the Chief!
- Capturing the Keystone
- Securing the Celestial Ridge
- Full Triangle
The storyline at a glance
Netherstorm has 103 steps, from Distraction at Manaforge B'naar to Dimensius the All-Devouring.
Maps its steps are placed on (steps per map): Netherstorm (98), Shattrath City (4), Terokkar Forest (1).
Other storylines on the Netherstorm map
- Lorewalking: Ethereals
- Burning Crusade Chromie Time Breadcrumbs
Steps, storylines and map placement from the client’s QuestLine, prerequisite and QuestPOI data; neighbouring quest text is Blizzard’s own (quest API), shortened to its opening sentences.
Achievements
Completing this quest counts toward this achievement.
- Into the Nether: its criteria name 14 quests, this one included.