Its just like Hand of the Reaper, its something tunnel merchants build statues and waterfall tributes to their empires off of, and functionally unimportant in the grand scheme of things.
If I was to sit a young necro down and they asked me what the least efficient way to level would be....
Fear/Kite everything. Make sure to blow 80% mana a kill to outdamage the pet instead of duoing to xp safer and quicker. Ignore charming undead entirely. Also, for the love of god, blow 40k to make sure you get the free mana clicky so you can waste all your mana outdmging your pet while casting fear as slowly as possible instead of medding ticks.
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