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...So what exactly is this thing?
"It's a replica of the data recorded when you mimicked the Thousand-Faced Immortal's jumping technique, but there's a subtle—and, well, huge—difference from our technology. So, we don't really know what it is."
"Think of it as a single-use emergency escape tool."
Oh... consumes a massive amount of returning-to-void essence... Can you really survive after using this thing to escape?
Nevertheless, this bell essentially acts as a one-time escape tool comparable to an Enlightenment-level teleportation ability. Without infiltrating someone's stronghold in Penglai, where else could you find so many Enlightenment-level tools? At least, even if you're at the end of your rope, it's better to use the bell to escape than to let the Thousand-faced Immortal possess you again and nearly die, right?
One life is not too much to lose, I suppose.