Spider-Puro, as Vier has given its name, is a small plushie spider created using Arenea's Bloodline Magic, the Deamon Arachne Web Thread Magic - Doll Creation.
It might be just an ordinary plushie spider on its outside appearance, but what is inside is a dozen small spiders, around the size of a fingernail, which are actually clones of Arenea's Sub-Spirit, Arachnid.
Through a series of mysterious and hidden experiments, Arenea, who's a high-ranking Alchemist, was able to create an artificial Sub-Spirit that can operate further away from its original body as long as it has enough Mana to sustain itself.
Spider-Puro was created with only one single purpose, for Arenea to be able to continuously observe Vier, her dear apprentice.
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Back at the time when Vier opens the box containing Spider-Puro.
...We're out! Finally out!...
...But we like it inside the box...
