Supported Macros:
{{age: YYYY-MM-DD}} - use in-game year, shows only age in years, works with only a year too
{{agewithdate: YYYY-MM-DD}} - use in-game year, shows age plus birthday
{{discord: url}} - creates a discord (message) link for app and browser
{{wiki: title}} - creates a link to a wiki page with the given title

The bio also supports Markdown, similar to Discord.
What might be of interest, among others:
*italic text*
**bold text**
- List items
## Header
### Smaller Header
#### Very Small Header
[Website Link Title](URL)