manna
Refers to the miraculous food from heaven in the Bible, or metaphorically to an unexpected benefit.
In the Old Testament, God is said to have given manna to the Israelites in the wilderness.
mana
A Polynesian concept of spiritual power or life force, often used in anthropology, fantasy, and gaming contexts.
Using this spell consumes a lot of mana.
In Polynesian culture, mana is considered a supernatural power residing in people and objects.
The Bible tells the story of manna falling from heaven.
I ran out of mana in the middle of the battle.
Mana gradually recovers when you rest.