Before you can use it you must know what it is. Necromancer--a wizard or witch of fictional imagination. S/He uses dark arts as a power as in games like runescape to the Harry Potter series.
An example: I am a Level 10 Necromancer in Runescape and in World of Warcraft.
Another: Harry Potter was almost killed by Voldemort, a highly skilled necromancer.
Necromancy is considered an evil practice by many.
"Necromancer"
The necromancer raised the dead and tried to start an army.
The wicked necromancer conjured up demons through his arcane diabolism.
I am not writing a sentence using that word.
a sentence using the word endotracheal
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Technically you just did , but another would be "Only a necromancer could bring back the dead besides god."
this is a sentence using the word armchair.
I am saying a sentence using the word collagen.
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Need a sentence using the word crater?