and also, in Naga, Dwarf, and Necropolis, the Earth magic is very effective, unlike Shield.
Not to mention that I've seen countless times how Earth magic is used in the late game, both against neutral creatures (like high-level banks with dragons) and against opponents.
Regarding effectiveness, it's pointless to argue; Earth magic provides a stronger effect. But the question is how often it's used and how versatile it is. Based on these indicators, Earth magic seems more advantageous to me.
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