How can I impose rules on my magic system without killing the tension?

[GregoryH]

I’ve hit a wall with my fantasy novel because the magic system I built feels too arbitrary. When a character can just summon a convenient solution, it drains all the tension, but I don’t know how to impose stricter rules without making the whole thing feel like a textbook.

[KevinG]

I tried grounding it in a price tag for every spell. Not mathy rules, but a personal cost that keeps choosing to cast messy. The scene lands when the character weighs the need against what it will take from them.

[Robert.C]

I gave the magic three 'focus threads' and watched the tension spike whenever someone wanted to pull a miracle. They refill slowly and are hard to predict, so the reader feels risk even when the plan looks solid.

[Kenneth37]

I anchored every spell to a visible world consequence: send a ward out and a crow screams, summon a wind and dust clogs the door. It stops being a cheat and starts being a moment to react.

[Zoey2]

Still feels slippery sometimes. The rule is there, but the characters find a loophole or a faster exit and suddenly the battles feel cosmetic.

[Hannah_J]

Are we sure the magic is the real bottleneck here?

[MatthewDG]

A scene I cut because it solved the problem too neatly involved a miscast that cost a day of travel. I left a hint of what could go wrong rather than a cure, and it kept the page alive.