While interesting you need to find some patch notes indicating these things at specific era markers.
This patch note did catch my eye though
October 1999
Quote:
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The Burnout Series (Magicians) has had the negative HP component reduced (improvement) and the stat buff increased (improvement). Because of this, the spells are no longer permanent. They now have a 15 minute duration. Burnout III has also had its casting cost reduced.
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Turns out Burnout line used to be permanent and decrease pet HP/had lower offensive properties. This definitely would hurt a solo mages Power.