Iron Vault includes various settings for tweaking the behavior of its features, to allow you to shape it into a better tool for your use case.
You must load a single complete base ruleset for functionality like characters to function properly. It is currently possible to load multiple rulesets at once, but this may behave in unexpected ways.
For more on rulesets, see Rulesets and Homebrew.
For more on homebrew, see Rulesets and Homebrew > Homebrew.
These options control various parts of how Mechanics Blocks are rendered.