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[Scatty]

Originally Posted by Pex

To be honest, I don't summon anything else except those two (and of course magic spirits) until late in the game when I have heaps of mana so I don't really mind having a drake of some kind, just for the sake of having it

An army of 3-4 Wraiths, or same amount of Death Knights is extremely useful in the beginning to conquer nearby enemy cities and weaker but still otherwise too hard nodes / lairs / dungeons etc. Just think of an army of undead troll units - no upkeep, regeneration and unrest repression.
Wraiths are better though because Death Knights have first strike ability, and that one doesn't steal life / convert a unit to an undead one after fight so it hinders more than helps, especially when the Death Knights are hurt. Both of those aren't exactly cheap in upkeep so Conjurer helps there.