So you learnt the spell up to level 5 (ie 52-112 damage)? Level 2 is 14-30 damage.
Check the stats of an opponent in the trophy section of your diary, and see what their armour class and resistances are. A fire missile, for example, will do much less damage to a fire demon compared to a water demon.
Starting in act 2 there are more powerful and more mana efficient spells available, particularly shaman magic.
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