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.
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In a mere seconds I spent some Mana and placed a Demon Tower inside of my Divine Realm, which would be the catalyst for our little Archdemon friend to manifest himself.
Ding!
[You have exchanged 500.000 Mana; you have created an [Archdemon Tower of Greed] within your World Realm!]
[It is now possible for you to Summon Demons by spending more Mana within your World Realm.]
[You acquired the [Demonic Tower Master: Lv1] Title Skill.]
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[Demonic Tower Master: Lv1]
As the one that has given the powerful authority to Summon Demonic Towers, your affinity with all Demonic things has increased greatly, and so it has increased as well with the depths of Hell itself.
You're favored not only by an Archdemon as powerful as Mammon, but also by Lucifer, who holds you very dearly, and has even given his name as your second name to you.
All Demons have favorability +500%.
Check "The Protagonist's Sister Is Actually the Strongest"!