How logical does a fantasy system of magic have to be?

In worldbuilding for a new fantasy world that is thick with magic, I ask myself how much sense a fantasy system of magic has to make. And contemplate the nature of the human soul.

I’m worldbuilding for my new fantasy novel, and an important part of that is figuring out the universe’s system of magic. I’m trying something a bit different in this story, with a universe that’s less earth-like and more magical.

We’re talking isolated settlements floating over a void through which people must travel to move between them, venomous tree octopuses, and magical orbs exuded by a leviathan of the deep void. You want magic? It drips from every tree.

The problem is, it’s really hard to come up with a unified concept of magic that explains all the weird magic stuff in this universe. I know magic is allowed to be mysterious and, well, magical, but I’ve always preferred magic systems that have a certain logic to them, even if the logic includes a few leaps of possibility.

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