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This strategy usually results in a loss of mana – the opponent is more likely to have mana than not, and you are simply giving them the opportunity to cast Bless.

The same applies to Bloodlust, although it's easier in that case. Stone Skin is actually the 4th most important Earth skill (excluding combat skills) after Word of Stone, Shield, and Resurrection.

Essentially, besides Berserk and Teleport, nothing else is used in Fire magic (among element-dependent spells, meaning combat skills and Blindness are not included). Or rather, it is used very rarely.