"Hmm...let's see..." Desire murmured as he willed for the Unknown to give more information about the Mana Heart.
As soon as he did, the Unknown immediately appeared right in front of him, giving more information about the Mana Heart.
[Mana Heart is an organ that can be found in any monster. It is where the life force of the monster is stored, which can be converted to mana and be used as some sort of trump card when the monster's mana has run out.]
And that was all the Unknown had to say about the Mana Heart.
"Hmm...I remember when I was a baby that because of my lack of mana, I had to use my life force as a substitute so that I can maintain that summoned guy...is that how it works?"
Indeed, what Desire said was the truth. When he was but a baby, there was a time when he used his life force to summon someone.
Of course, that was indeed how the Mana Heart works.
