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Without wanting to waste another second, I decided to immediately use the Legendary-Grade Dungeon Heart Core.
We rushed into the distance, around some grassy mountains with Kireina and Katrina at my side, as I put the core into the ground and then… filled it with Mana until I got tired of giving it.
We moved away a bit more and waited.
…
…
…
"Nothing is happening, Master…" said Katrina with a disappointed look.
"I am aware…" I sighed.
"Can Gaia tell you anything regarding that?" asked Kireina curiously.
"Patience…" said Gaia.
"She said to wait for it, to have a bit of patience," I said.
"I see…" said Kireina.
"I don't have much patience," said Katrina.
"Geez…"
BOOOM!!!
Suddenly, the entire ground began to tremble as the Dungeon Heart Core started to release circuit-like runes all across the ground around it!
TRUUUUUMMM!!!
Check "The Protagnist's Sister Is Actually the Strongest"!