Kamikaze
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Undoubtedly, the first level is the most used, by 90% of players, or even more. After all, Haste, Slow, Bless, Cure, Curse & Shield are very useful.
The second level is also quite often used, although by a smaller number of players. Lightning (or Ice Bolt) and Blindness.
The third level is mainly used for Forgetfulness, the rest are for fun (I rarely play as Necropolis).
The fourth level can compete with the first in terms of usefulness (for me personally, City Portal and Restoration are my two favorite spells), as it contains both offensive and non-offensive spells.
And the fifth... Flight, Door, and Implosion.
So: 1, 4, 2, 5, 3.
The second level is also quite often used, although by a smaller number of players. Lightning (or Ice Bolt) and Blindness.
The third level is mainly used for Forgetfulness, the rest are for fun (I rarely play as Necropolis).
The fourth level can compete with the first in terms of usefulness (for me personally, City Portal and Restoration are my two favorite spells), as it contains both offensive and non-offensive spells.
And the fifth... Flight, Door, and Implosion.
So: 1, 4, 2, 5, 3.