Alter Aeon Online Help

Keywords are:  'spell damage tier speed minor low moderate high massive'

The help pages for combative spells have entries for Damage and Speed.

Speed is the amount of lag the spell causes to the caster. Spells with
high speeds cause very little lag, and spells with low speeds cause
a high amount of lag.

Damage gives a rough idea of how damaging a spell is relative to other
spells. The categories encompass a range of calculations. Some spells
may have very high average damage but low maximum damage, while another
spell with the same damage descriptor may have very high maximum damage
but very low minimum damage. Most spells scale fairly aggressively with
level, but some (like the cleric inflict spells) have only minimal
scaling.

Some spells do more or less damage to certain types of creatures, or
when certain conditions are met, or they may inflict debuffs such as
burning, hypothermia, nausea or bleeding. Most of these spells will
have a "special" disclaimer in the Damage description, with the
feature of the spell being more fully explained in the text of the
help page.