Ep. 217 How Spells Work

How do spells actually work — and why do some only affect certain creatures? In this episode of FGGGbT, the Brain Trust — Daniel J. Glenn, Dr. Michael Dennin, and Ben Sieper — break down the mechanics, physics, and philosophy behind spellcasting in D&D and beyond.
We explore the power of true names and pronunciation (Cthulhu, anyone?), the science behind spell foci like wands — including a deep dive into electrostatics and why wood might not be a coincidence. We dig into why Charm Person doesn’t work on a dog, why Hold Monster is harder than Hold Person, and why elves are immune to Sleep (spoiler: they don’t actually sleep).
Then we get into the physics of Fireball vs. Wall of Fire, including a true story about an accidental wall of fire in a college lecture hall. Finally, we tackle one of science’s oldest debates — is magic (and math) invented or discovered? — using the Newton vs. Leibniz and Edison vs. Tesla rivalries as our guide.
Whether you’re a D&D player who’s always wondered why Otto’s Irresistible Dance might not work on someone without legs, or a science fan curious about the line between magic and physics, this episode is for you.

Topics Covered:

True names & the power of words in magic systems
Spell foci: wands, electrostatics & druidic focus items
Charm Person vs. Charm Monster — the biology of persuasion
Hold Person vs. Hold Monster & paralysis mechanics
Why Sleep affects (almost) everyone — and why elves are immune
The physics of Fireball, Wall of Fire & controlling chaotic energy
Named spells & the “second discoverer” effect (Newton, Leibniz, Tesla, Edison)
Is magic invented or discovered? The math debate