Fantasy
Not every magic system needs to behave like a vending machine.
Sometimes the better cost is social, emotional, or political. A spell can leave no scorch marks and still ruin a friendship, expose a secret, or make a character impossible to live with afterwards. That tends to feel more interesting than the neat little transaction where every power has a matching bruise, headache, or life-force drain.
Visible costs have their place. So do the messier ones. Fantasy gets dull when every piece of magic is forced to pay the same bill.
Sometimes the better cost is social, emotional, or political. A spell can leave no scorch marks and still ruin a friendship, expose a secret, or make a character impossible to live with afterwards. That tends to feel more interesting than the neat little transaction where every power has a matching bruise, headache, or life-force drain.
Visible costs have their place. So do the messier ones. Fantasy gets dull when every piece of magic is forced to pay the same bill.
The trouble starts when the cost is too tidy. If magic always takes one clean, measurable thing, it begins to feel like accounting with sparks. I’m more interested in the damage that spreads sideways. A spell can be “paid for” and still leave everyone in the room worse off in ways nobody can neatly tally. That’s usually where the horror is, anyway.