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As Lucifer and Partner were taking down dozens of slimes, more continued to come here. As if it there were hundreds if not thousands of them! What did this Dungeon even do to make so many god damn slimes? I do remember fighting like four or five back then, but there are dozens now, hundreds! Maintaining the barrier is already quite taxing, especially because they constantly deal damage to it through their dissolving juices.
I have to constantly spend Mana, so my Mana is constantly going down with that of Emeraldine, all while I have to absorb the Mana from the surrounding slimes. They were many so it was still a sustainable strategy. The Mana from the Slimes constantly flowed towards me, and then I shared it with Emeraldine, so we continued to spend Mana together from a shared MP Pool, reinforcing the barrier with several layers at once.
Check "The Protagnist's Sister Is Actually the Strongest"!