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"I would like to know if, when I have 10 mana spent gained as ward and, for example, 50% mana efficiency, the game reduces the ward gain or still considers it as 10 mana spent?"
External link →"I would like to know if, when I have 10 mana spent gained as ward and, for example, 50% mana efficiency, the game reduces the ward gain or still considers it as 10 mana spent?"
External link →Mana spent is the amount your mana went down when you spent mana.
Mana efficiency means that mana does more.
For OP instance, only 5 mana is gain as ward?
If you are at 100 mana and then you use an ability and your mana goes down to 90, you have just spent 10 mana. The mana efficiency number has nothing to do with it.
Edit: I guess if you're trying to pre-calculate the amount, the mana efficiency value does mean you spend less mana than the mana cost on the tooltip says you will so it kinda affects it in a round about way.