this post was submitted on 19 May 2025
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What metal is the crown made of?
The spell only works on iron and iron-heavy alloys. An advanced version of the spell exists but the players don't have it yet.
Technically, rust can only occur on iron-heavy metals and alloys. Otherwise it's just called oxidation.
The difference with "rust" is that rust will eat into the metal and change its shape, while oxydation only changes the surface color and texture.
Edit: yeah... Rust is a specific type of oxydation, it wasn't really clear from my comment. What I wanted to say is that rust implies the material is iron-based!
Well, not quite. Rust eats into iron because oxidised iron is larger and much more brittle than unoxidised iron, physically ripping itself out of place.
Many oxides arent that much larger than their base metals and form a nice patina protecting the metal underneath, like in aluminium.
Other oxides destroy the structural integrity of the metal and eat into it, forming corrosion. Rust is just corrosion specific to iron.
I didn't know of other type of oxides that eat into the metal like rust does...
But it's true that a "rusted crown" implies that it is iron-based, so the cantrip should work!