Whiteboxes: an idea I've been toying with
Aka: playing around with my magic system
Pic taken from googling "white decorative box" idk even what these things really look like. They're white. They're boxes. Idk.
So the way I've envisioned magic in my world is that it's basically a natural force that makes up all that can't be seen or understood. It creates/causes/allows hypothetical possibility. And it exists within a sort of shadow plane alongside our own, and what we see is just sort of a reflection, bits and pieces peeking through a veil.
This plane is where it is drawn from by a user. However, it must be drawn through a conduit of some kind (a staff/wand/other instrument) that is made of substances from this plane, because this is what filters out all the Bad Stuff that would be harmful if it came through in its pure form from this other realm.* Sometimes rifts occur and "dirty"/unfiltered magic comes through and this can be Very Bad. It can cause plague, crop failure, drought and extreme weather; or smaller, less noticeable effects like static in the air and untraceable humming or buzzing sounds.
Another way in which magic can be harmful is through energy loss. When magic is channeled into our realm, some fractions of its power are inherently lost in the process, and this ‘wasted’ magic can be equally harmful in large doses.
This is where Whiteboxes come in. A Whitebox is a device used when a magic user does Something Big which causes a lot of waste, to trap that wasted energy so it can’t escape into our plane. Because of this, Whiteboxes are highly dangerous - magic users will keep them close at hand or store them somewhere safe and hidden to ensure nobody will come across them by accident, but it does occasionally happen, and if they are handled incorrectly and that magical waste is let out...bad things happen. And the longer the waste is left in a Whitebox, the stronger and more concentrated it becomes.
Here's the bit I'm not sure about yet. What exactly are they made of? It must be some material that contains the wasted energy, but what could that be? I'll think about it.
*The danger, of course, is people who don't know this and use magic inadvertently. There is such a stigma and taboo surrounding magic at all, that nobody thinks to ask and further understand, and therefore mistakes happen. A lot of inexperienced and/or uneducated magic users often end up channeling magic directly through their own body rather than an instrument, which can both cause further leaks and physical harm to the user.
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